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LONG-TERM DEBT - Senior Secured Notes (Details) - USD ($)
3 Months Ended
Mar. 07, 2018
Mar. 31, 2018
Mar. 31, 2017
Feb. 05, 2018
Dec. 31, 2017
Nov. 30, 2017
Feb. 28, 2017
Line of Credit Facility [Line Items]              
Loss on extinguishment of debt   $ 11,683,000 $ 12,458,000        
Senior Notes | 12% Senior Secured Notes              
Line of Credit Facility [Line Items]              
Debt instrument, face amount           $ 135,000,000 $ 470,000,000
Stated interest rate   12.00%          
Loss on extinguishment of debt $ 11,700,000   $ 12,500,000        
Debt issuance costs capitalized         $ 18,300,000    
Notice of redemption, amount       $ 77,500,000      
Redemption price, percentage 112.00%            
Long-term debt $ 527,500,000 $ 511,493,000     $ 585,823,000