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Equity Investments - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
Dec. 31, 2018
USD ($)
ft
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]          
Investee losses in excess of investment   $ 6,035 $ 7,567    
Loss from equity method investments   3,918 2,368 $ 2,166  
Distributions from equity investment   0 0 1,200  
Sale of ownership interest for cash   $ 0 0 25,000  
Independence Hub, LLC          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership interest   20.00%      
Water depth (in feet) | ft   8,000      
Investee losses in excess of investment   $ 11,200 9,800    
Loss from equity method investments   $ 3,900 $ 2,400 $ 2,200  
Deepwater Gateway, L.L.C.          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership interest         50.00%
Distributions from equity investment $ 1,200        
Sale of ownership interest for cash $ 25,000