Annual report pursuant to Section 13 and 15(d)

Segment Information (Disaggregation of Revenue) (Details)

v3.19.3.a.u2
Segment Information (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Lease revenues                 $ 217,230 $ 201,112 $ 191,526
Operating revenues $ 192,761 $ 200,658 $ 197,023 $ 209,524 $ 213,838 $ 220,257 $ 216,831 $ 184,824 799,966 835,750 650,847
Voyage charters                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 46,381 73,979 33,623
Contracts of affreightment                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 226,857 231,247 204,261
Tariff                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 79,757 74,157 68,266
Unit freight                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 63,420 58,326 50,693
Terminal operations                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 16,562 21,501 21,488
Fleeting operations                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 17,264 17,888 15,561
Logistics services                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 15,155 14,309 8,868
Time and material contracts                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 87,167 119,196 33,352
Retainer contracts                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 9,874 10,124 10,192
Product sales                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 5,555 2,686  
Other                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 14,744 11,225 13,017
Ocean Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 423,288 414,844 352,876
Inland Services                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 267,334 285,688 248,452
Witt O’Brien’s                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 101,663 131,629 49,055
Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 7,681 3,589 464
Operating Segments | Ocean Services                      
Disaggregation of Revenue [Line Items]                      
Lease revenues                 205,346 193,242 183,234
Operating revenues                 423,288 414,844 352,876
Operating Segments | Ocean Services | Voyage charters                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 46,381 73,979 33,623
Operating Segments | Ocean Services | Contracts of affreightment                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 24,540 11,872 15,181
Operating Segments | Ocean Services | Tariff                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 79,757 74,157 68,266
Operating Segments | Ocean Services | Unit freight                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 63,420 58,326 50,693
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  
Operating Segments | Ocean Services | Other                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 3,844 3,268 1,879
Operating Segments | Inland Services                      
Disaggregation of Revenue [Line Items]                      
Lease revenues                 10,902 7,392 8,292
Operating revenues                 267,334 285,688 248,452
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                 202,317 219,375 189,080
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                 16,562 21,501 21,488
Operating Segments | Inland Services | Fleeting operations                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 17,264 17,888 15,561
Operating Segments | Inland Services | Logistics services                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 15,155 14,309 8,868
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  
Operating Segments | Inland Services | Other                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 5,134 5,223 5,163
Operating Segments | Witt O’Brien’s                      
Disaggregation of Revenue [Line Items]                      
Lease revenues                 0 0 0
Operating revenues                 101,783 131,709 49,156
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                 87,167 119,196 33,352
Operating Segments | Witt O’Brien’s | Retainer contracts                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 9,874 10,124 10,192
Operating Segments | Witt O’Brien’s | Product sales                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 0 0  
Operating Segments | Witt O’Brien’s | Other                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 4,742 2,389 5,612
Operating Segments | Other                      
Disaggregation of Revenue [Line Items]                      
Lease revenues                 982 478 0
Operating revenues                 7,681 3,589 464
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                 5,555 2,686  
Cost of goods and services sold                 4,500 2,100  
Operating Segments | Other | Other                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 1,144 425 464
Corporate And Eliminations                      
Disaggregation of Revenue [Line Items]                      
Lease revenues                 0 0 0
Operating revenues                 (120) (80) (101)
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  
Corporate And Eliminations | Other                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 $ (120) $ (80) $ (101)