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DEBT - 2021 Notes (Details) - USD ($)
12 Months Ended
Feb. 11, 2014
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2013
Mar. 25, 2010
2021 Notes          
Debt Instrument [Line Items]          
Aggregate principal debt amount $ 200,000,000.0        
Stated interest rate 8.875%        
Unamortized Discount $ 5,000,000        
Repurchase price percentage offer 101.00%        
Proceeds from Issuance of Long-term Debt $ 194,500,000        
2021 Notes | Redemption Period One          
Debt Instrument [Line Items]          
Debt Redemption Amount, Maximum 35.00%        
Debt Redemption Price 108.88%        
Senior Secured Revolving Credit Facility          
Debt Instrument [Line Items]          
Repayments of Short-term Debt $ 59,300,000 $ 17,200,000      
Term Loan Facilities          
Debt Instrument [Line Items]          
Repayments of Short-term Debt   $ 37,000,000      
Repayments of Long-term Debt $ 135,200,000        
Unsecured Debt | 2015 Notes          
Debt Instrument [Line Items]          
Stated interest rate   10.25% 10.25% 10.25% 10.25%