Annual report pursuant to Section 13 and 15(d)

Operating Leases Major Classes of Property and Equipment Earning Lease Revenues (Details)

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Operating Leases Major Classes of Property and Equipment Earning Lease Revenues (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost $ 1,441,871 $ 1,442,382 $ 1,407,329
Accumulated depreciation (647,679) (624,024) (560,819)
Net property and equipment 794,192 818,358 $ 846,510
Property Subject to Operating Lease      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 679,781 685,531  
Accumulated depreciation (321,758) (295,185)  
Net property and equipment 358,023 390,346  
Ocean Services | Property Subject to Operating Lease      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 629,166 634,916  
Accumulated depreciation (316,439) (291,687)  
Net property and equipment 312,727 343,229  
Ocean Services | Property Subject to Operating Lease | Petroleum and Chemical Carriers - U.S.-flag      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 544,549 544,549  
Accumulated depreciation (280,432) (258,153)  
Net property and equipment 264,117 286,396  
Ocean Services | Property Subject to Operating Lease | Harbor Tugs - U.S.-flag & foreign-flag      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 45,379    
Accumulated depreciation (18,313)    
Net property and equipment 27,066    
Ocean Services | Property Subject to Operating Lease | Ocean liquid tank barges - U.S.-flag      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 39,238 39,238  
Accumulated depreciation (17,694) (16,171)  
Net property and equipment 21,544 23,067  
Ocean Services | Property Subject to Operating Lease | Harbor and Offshore Tugs - U.S.-flag & foreign-flag      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost   51,129  
Accumulated depreciation   (17,363)  
Net property and equipment   33,766  
Inland Services | Property Subject to Operating Lease | Inland River Towboats      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 50,615 50,615  
Accumulated depreciation (5,319) (3,498)  
Net property and equipment $ 45,296 $ 47,117