Annual report pursuant to Section 13 and 15(d)

Equipment Acquisitions And Dispositions (Narrative) (Details)

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Equipment Acquisitions And Dispositions (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
equipment
Dec. 31, 2018
USD ($)
equipment
Dec. 31, 2017
USD ($)
vessel
equipment
Property, Plant and Equipment [Line Items]      
Capital expenditures $ 37,786 $ 50,272 $ 114,595
Sales price of equipment 2,500 16,100 164,800
Gain (loss) on disposition of property plant equipment $ 500 $ 6,600 23,300
Gain (loss) on sale of property, plant and equipment, recognized     10,000
Gain (loss) on sale of property, plant and equipment, deferred     13,300
Sale Leaseback      
Property, Plant and Equipment [Line Items]      
Gain (loss) on sale of property, plant and equipment, deferred     $ 13,300
Petroleum and chemical carriers - U.S.-flag      
Property, Plant and Equipment [Line Items]      
Sale leaseback transaction, number of leased assets disposed | vessel     1
Sale leaseback transaction, net proceeds     $ 134,900
Sale leaseback transaction, lease terms     104 months
Number of equipment disposed | equipment 0 1 1
Inland river dry-cargo barges      
Property, Plant and Equipment [Line Items]      
Sale leaseback transaction, number of leased assets disposed | vessel     50
Sale leaseback transaction, net proceeds     $ 12,500
Sale leaseback transaction, lease terms     84 months
Number of equipment disposed | equipment 0 32 50
Inland river specialty barge      
Property, Plant and Equipment [Line Items]      
Gain (loss) on disposition of property plant equipment     $ (300)
Number of equipment disposed | vessel     1
Gains on Asset Dispositions and Impairments, Net      
Property, Plant and Equipment [Line Items]      
Amortization of deferred gains on sale of property $ 2,400 $ 13,000 $ 2,300