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Commitments and Contingencies - Additional Information - Liquidity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]          
Net loss $ 124,743 $ 86,304 $ 113,768 $ 125,504  
Net operating cash flow     281,741 $ 307,505  
Working capital deficit 895,600   895,600    
Current portion of long-term debt $ 1,299,806   $ 1,299,806   $ 998,591