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Fair Value Measurements - Estimated Fair Value and Carrying Value of Long-Term Debt (Details) - Successor - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Oct. 04, 2016
Convertible Debt | Convertible Notes      
Fair Value, Assets and Liabilities Measured on Recurring Basis      
Fair Value     $ 445,700
Carrying value $ 0 $ 268,780  
Secured Notes | New Building Note      
Fair Value, Assets and Liabilities Measured on Recurring Basis      
Fair Value     $ 36,600
Carrying value 37,601 36,528  
Fair Value Measurements Level 2 | Convertible Debt | Convertible Notes      
Fair Value, Assets and Liabilities Measured on Recurring Basis      
Fair Value 0 334,800  
Fair Value Measurements Level 2 | Secured Notes | New Building Note      
Fair Value, Assets and Liabilities Measured on Recurring Basis      
Fair Value $ 41,638 $ 40,608