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LONG-TERM DEBT - Senior Secured Notes (Details) - Senior secured notes - USD ($)
1 Months Ended 3 Months Ended
Jun. 15, 2015
Dec. 31, 2014
Jun. 30, 2015
Mar. 31, 2017
Apr. 15, 2015
7.75% Notes due 2021          
Long-term debt          
Aggregate principal amount of debt   $ 350,000,000      
Interest rate (as a percent)   7.75%      
Debt issuance costs   $ 13,600,000      
Agreed upon time commercially reasonable efforts are to be made to aid purchasers in the resale of Notes   1 year      
Debt issuance costs and fees expensed on extinguishment of debt     $ 13,000,000    
7.25% Notes due 2021 (Refinanced Secured Notes)          
Long-term debt          
Aggregate principal amount of debt         $ 335,000,000
Interest rate (as a percent)       7.25% 7.25%
Class Of Warrant Or Right, Expiration Period 6 years        
Debt issuance discount $ 2,200,000