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Supplemental Cash Flow Information (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 25, 2015
Jul. 24, 2015
Jul. 23, 2015
Supplemental Cash Flow Elements [Abstract]            
Payments of interest and commitment fees $ 168,300 $ 157,400 $ 86,800      
Capitalized interest 15,000 26,600 17,100      
Cash paid for income taxes 1,000 1,300 900      
Incurred liabilities for fixed and intangible asset additions 39,700 33,700 68,600      
Schedule of Equity Method Investments [Line Items]            
Gain on basis step up on historical interest $ 0 $ 0 332,380      
SEKCO [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity investment, ownership percentage       50.00%    
Enterprise Offshore Acquisition [Member]            
Schedule of Equity Method Investments [Line Items]            
Gain on basis step up on historical interest     $ 332,380      
Enterprise Offshore Acquisition [Member] | CHOPS [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity investment, ownership percentage     50.00%   50.00% 50.00%
Equity interest step up acquired percentage     50.00%   100.00% 50.00%
Enterprise Offshore Acquisition [Member] | SEKCO [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity investment, ownership percentage     50.00%   50.00% 50.00%
Equity interest step up acquired percentage     50.00%   100.00% 50.00%