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LONG-TERM DEBT - Senior Unsecured Notes (Details) - USD ($)
3 Months Ended
Dec. 05, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2014
Debt Instrument [Line Items]        
Loss on extinguishment of debt   $ 14,600,000    
Senior unsecured notes        
Debt Instrument [Line Items]        
Principal amount of debt     $ 375,000,000 $ 350,000,000
Interest rate (as a percent)     7.50% 10.00%
Debt issuance discount       $ 3,800,000
Debt issuance costs     $ 6,100,000 $ 14,000,000
Loss on extinguishment of debt $ 37,200,000      
Make whole premium 26,300,000      
Debt issuance costs and fees expensed on extinguishment of debt $ 10,900,000      
Senior unsecured notes | Prior Credit Agreement, December 2014        
Debt Instrument [Line Items]        
Redemption price percentage 107.50%