Quarterly report pursuant to Section 13 or 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
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost $ 1,424,907 $ 1,407,329 $ 1,403,886
Accumulated depreciation 607,727 560,819 545,179
Net property and equipment 817,180 $ 846,510 $ 858,707
Property Subject to Operating Lease      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 596,511    
Accumulated depreciation 230,748    
Net property and equipment 365,763    
Ocean Services | Property Subject to Operating Lease      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 560,275    
Accumulated depreciation 227,662    
Net property and equipment 332,613    
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 471,049    
Accumulated depreciation 196,317    
Net property and equipment 274,732    
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 16,696    
Net property and equipment 34,433    
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 38,097    
Accumulated depreciation 14,649    
Net property and equipment 23,448    
Inland Services | Property Subject to Operating Lease | Inland River Towboats      
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]      
Historical cost 36,236    
Accumulated depreciation 3,086    
Net property and equipment $ 33,150