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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]          
Deferred financing costs     $ 81,097 $ 11,559 $ 11,942
Loss on debt extinguishment     8,392 $ 17,363 1,263
Switzerland and Glion Institutions          
Debt Instrument [Line Items]          
Loss on debt extinguishment         932
Convertible Debt | Exchanged Notes          
Debt Instrument [Line Items]          
Write off of deferred debt issuance costs   $ 1,681 8,392    
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        
Lines of credit | Senior Secured Credit Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Write off of deferred debt issuance costs         $ 331