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Intangible Assets (Schedule of Components of Intangible Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 201,636 $ 196,834
Accumulated Amortization 74,936 69,771
Carrying Value 126,700 127,063
Contract intangibles | Marine Transportation [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 800 800
Accumulated Amortization 625 607
Carrying Value 175 193
Contract intangibles | Offshore pipeline transportation    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 158,101 158,101
Accumulated Amortization 57,554 53,394
Carrying Value 100,547 104,707
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 42,735 37,933
Accumulated Amortization 16,757 15,770
Carrying Value $ 25,978 $ 22,163