Annual report pursuant to Section 13 and 15(d)

Segment Information (Disaggregation of Revenue) (Details)

v3.20.4
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)