Segment Information (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Lease revenues |
|
|
|
|
|
|
|
|
$ 198,121
|
$ 217,230
|
$ 201,112
|
| Operating revenues |
$ 213,531
|
$ 175,414
|
$ 172,585
|
$ 192,296
|
$ 192,761
|
$ 200,658
|
$ 197,023
|
$ 209,524
|
753,826
|
799,966
|
835,750
|
| Voyage charters |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
60,863
|
46,381
|
73,979
|
| Contracts of affreightment |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
211,887
|
226,857
|
231,247
|
| Tariff |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
68,758
|
79,757
|
74,157
|
| Unit freight |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
48,934
|
63,420
|
58,326
|
| Terminal operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
20,794
|
16,562
|
21,501
|
| Fleeting operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
17,993
|
17,264
|
17,888
|
| Logistics services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
15,892
|
15,155
|
14,309
|
| Time and material contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
78,184
|
87,167
|
119,196
|
| Retainer contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
11,823
|
9,874
|
10,124
|
| Product sales |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
6,402
|
5,555
|
2,686
|
| Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
14,175
|
14,744
|
11,225
|
| Ocean Services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenues |
|
|
|
|
|
|
|
|
381,255
|
423,288
|
414,844
|
| Inland Services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenues |
|
|
|
|
|
|
|
|
271,889
|
267,334
|
285,688
|
| Witt O’Brien’s |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenues |
|
|
|
|
|
|
|
|
92,416
|
101,663
|
131,629
|
| Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenues |
|
|
|
|
|
|
|
|
8,266
|
7,681
|
3,589
|
| Operating Segments | Ocean Services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Lease revenues |
|
|
|
|
|
|
|
|
185,872
|
205,346
|
193,242
|
| Operating revenues |
|
|
|
|
|
|
|
|
381,255
|
423,288
|
414,844
|
| Operating Segments | Ocean Services | Voyage charters |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
60,863
|
46,381
|
73,979
|
| Operating Segments | Ocean Services | Contracts of affreightment |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
12,876
|
24,540
|
11,872
|
| Operating Segments | Ocean Services | Tariff |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
68,758
|
79,757
|
74,157
|
| Operating Segments | Ocean Services | Unit freight |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
48,934
|
63,420
|
58,326
|
| Operating Segments | Ocean Services | Terminal operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Ocean Services | Fleeting operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Ocean Services | Logistics services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Ocean Services | Time and material contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Ocean Services | Retainer contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Ocean Services | Product sales |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Ocean Services | Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
3,952
|
3,844
|
3,268
|
| Operating Segments | Inland Services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Lease revenues |
|
|
|
|
|
|
|
|
11,850
|
10,902
|
7,392
|
| Operating revenues |
|
|
|
|
|
|
|
|
271,889
|
267,334
|
285,688
|
| Operating Segments | Inland Services | Voyage charters |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Inland Services | Contracts of affreightment |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
199,011
|
202,317
|
219,375
|
| Operating Segments | Inland Services | Tariff |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Inland Services | Unit freight |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Inland Services | Terminal operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
20,794
|
16,562
|
21,501
|
| Operating Segments | Inland Services | Fleeting operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
17,993
|
17,264
|
17,888
|
| Operating Segments | Inland Services | Logistics services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
15,892
|
15,155
|
14,309
|
| Operating Segments | Inland Services | Time and material contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Inland Services | Retainer contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Inland Services | Product sales |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Inland Services | Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
6,349
|
5,134
|
5,223
|
| Operating Segments | Witt O’Brien’s |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Lease revenues |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating revenues |
|
|
|
|
|
|
|
|
92,480
|
101,783
|
131,709
|
| Operating Segments | Witt O’Brien’s | Voyage charters |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Contracts of affreightment |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Tariff |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Unit freight |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Terminal operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Fleeting operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Logistics services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Time and material contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
78,184
|
87,167
|
119,196
|
| Operating Segments | Witt O’Brien’s | Retainer contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
11,823
|
9,874
|
10,124
|
| Operating Segments | Witt O’Brien’s | Product sales |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Witt O’Brien’s | Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
2,473
|
4,742
|
2,389
|
| Operating Segments | Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Lease revenues |
|
|
|
|
|
|
|
|
399
|
982
|
478
|
| Operating revenues |
|
|
|
|
|
|
|
|
8,266
|
7,681
|
3,589
|
| Operating Segments | Other | Voyage charters |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Contracts of affreightment |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Tariff |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Unit freight |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Terminal operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Fleeting operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Logistics services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Time and material contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Retainer contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating Segments | Other | Product sales |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
6,402
|
5,555
|
2,686
|
| Cost of goods and services sold |
|
|
|
|
|
|
|
|
4,500
|
4,500
|
2,100
|
| Operating Segments | Other | Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
1,465
|
1,144
|
425
|
| Corporate And Eliminations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Lease revenues |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Operating revenues |
|
|
|
|
|
|
|
|
(64)
|
(120)
|
(80)
|
| Corporate And Eliminations | Voyage charters |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Contracts of affreightment |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Tariff |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Unit freight |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Terminal operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Fleeting operations |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Logistics services |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Time and material contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Retainer contracts |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Product sales |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Corporate And Eliminations | Other |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from contracts with customers |
|
|
|
|
|
|
|
|
$ (64)
|
$ (120)
|
$ (80)
|