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Debt - Debt Modification and Loss on Debt Extinguishment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Deferred financing costs     $ 513 $ 81,097 $ 11,559
Loss on debt extinguishment     7,481 8,392 17,363
Convertible Debt | Exchanged Notes          
Debt Instrument [Line Items]          
Write off of deferred debt issuance costs   $ 1,681      
Deferred financing costs       70,800  
Convertible Debt | Exchanged Notes | General and Administrative Expense          
Debt Instrument [Line Items]          
Loss on modification of debt       22,800  
Convertible Debt | Fifth Amendment and Restated Credit Agreement          
Debt Instrument [Line Items]          
Write off of deferred debt issuance costs $ 15,682        
Reconciling items          
Debt Instrument [Line Items]          
Loss on debt extinguishment     $ 7,481 $ 8,392 $ 17,363