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Long-Term Debt Senior Secured Second Lien Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 01, 2013
Aug. 01, 2013
Apr. 30, 2017
Dec. 31, 2016
Mar. 31, 2017
Debt Instrument [Line Items]          
Acceleration of deferred financing costs and amortization of debt discount       $ 2,266,000  
Senior Notes | 9.875% Senior Secured Second Lien Notes due 2021          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 735,000,000 $ 735,000,000      
Debt discount (premium), percent 98.00% 98.00%      
Proceeds from issuance of senior long-term debt $ 720,300,000        
Debt instrument, interest rate 9.875% 9.875%     9.875%
Debt instrument, redemption percentage   101.00%      
Extinguishment of debt, amount         $ 28,409,000
Senior notes         691,591,000
Payments of debt extinguishment costs         71,000
Debt instrument, unamortized discount         3,409,000
Repayment of long-term borrowings         25,606,000
Acceleration of deferred financing costs and amortization of debt discount         $ 678,000
Senior Notes | 9.875% Senior Secured Second Lien Notes due 2021 | Maximum          
Debt Instrument [Line Items]          
Debt instrument, additional special interest, annual rate increase, per year 1.00% 1.00%      
Subsequent Event | Senior Notes | 9.875% Senior Secured Second Lien Notes due 2021          
Debt Instrument [Line Items]          
Extinguishment of debt, amount     $ 28,645,000    
Senior notes     662,946,000    
Payments of debt extinguishment costs     72,000    
Debt instrument, unamortized discount     3,730,000    
Repayment of long-term borrowings     $ 24,915,000