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Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 211,946 $ 220,192
Accumulated Amortization 79,977 81,265
Carrying Value 131,969 138,927
Contract intangibles | Marine Transportation    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,800 27,800
Accumulated Amortization 25,752 23,033
Carrying Value 2,048 4,767
Contract intangibles | Offshore pipeline transportation    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 158,101 158,101
Accumulated Amortization 40,912 36,752
Carrying Value 117,189 121,349
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 26,045 34,291
Accumulated Amortization 13,313 21,480
Carrying Value $ 12,732 $ 12,811