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Intangible Assets, Goodwill and Other Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 220,192 $ 230,908
Accumulated Amortization 81,265 68,306
Carrying Value $ 138,927 162,602
Other    
Finite-Lived Intangible Assets [Line Items]    
Weighted Amortization Period in Years 9 years  
Gross Carrying Amount $ 34,291 31,747
Accumulated Amortization 21,480 16,875
Carrying Value $ 12,811 14,872
Onshore facilities and transportation | Intangible associated with lease (1)    
Finite-Lived Intangible Assets [Line Items]    
Weighted Amortization Period in Years 15 years  
Gross Carrying Amount $ 0 13,260
Accumulated Amortization 0 5,407
Carrying Value $ 0 7,853
Marine transportation    
Finite-Lived Intangible Assets [Line Items]    
Weighted Amortization Period in Years 5 years  
Marine transportation | Contract intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 27,800 27,800
Accumulated Amortization 23,033 17,593
Carrying Value $ 4,767 10,207
Offshore pipeline transportation    
Finite-Lived Intangible Assets [Line Items]    
Weighted Amortization Period in Years 19 years  
Offshore pipeline transportation | Contract intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 158,101 158,101
Accumulated Amortization 36,752 28,431
Carrying Value $ 121,349 $ 129,670