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LONG-TERM DEBT - Senior Unsecured Notes (Details) - USD ($)
1 Months Ended
Nov. 20, 2015
Aug. 11, 2015
Aug. 31, 2013
Mar. 31, 2012
Sep. 30, 2016
Jun. 30, 2016
Nov. 30, 2015
Sep. 30, 2015
Debt Instrument [Line Items]                
Accrued interest         $ 5,512,000     $ 12,055,000
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes                
Debt Instrument [Line Items]                
Loan face amount     $ 500,000,000          
Note stated interest rate (as a percent)     9.75%   9.75%     9.75%
Proceeds from issuance of debt   $ 85,000,000            
Debt outstanding before discount   $ 585,000,000            
Effective interest rate of amounts outstanding (as a percent)         10.04%      
Accrued interest         $ 4,800,000     $ 4,800,000
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes | Redeemable in Whole or in Part                
Debt Instrument [Line Items]                
Redemption price (as a percent)     100.00%          
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes | Redeemable Rate Upon Change of Control                
Debt Instrument [Line Items]                
Redemption price (as a percent)     101.00%          
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes | Redeemable Rate Upon Certain Asset Sales                
Debt Instrument [Line Items]                
Redemption price (as a percent)     100.00%          
Senior Unsecured Notes | 2015 Senior Unsecured Notes                
Debt Instrument [Line Items]                
Loan face amount $ 100,000,000              
Effective interest rate of amounts outstanding (as a percent)         6.39%      
Prepaid Interest         $ 1,100,000      
Redemption price (as a percent) 100.00%              
Senior Unsecured Notes | 2015 Senior Unsecured Notes | Redeemable in Whole or in Part                
Debt Instrument [Line Items]                
Premium on debt redemption (as a percent) 0.25%              
Senior Unsecured Notes | 2015 Senior Unsecured Notes | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent) 4.45%              
Debt instrument, variable rate at period end (as a percent)           0.85%    
Credit Facility | Facility Agreement                
Debt Instrument [Line Items]                
Borrowing capacity             $ 200,000,000  
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes                
Debt Instrument [Line Items]                
Loan face amount       $ 344,200,000.0        
Note stated interest rate (as a percent)       11.00% 11.00%     11.00%
Effective interest rate of amounts outstanding (as a percent)         11.50%      
Accrued interest         $ 490,000     $ 490,000
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes | Redeemable in Whole or in Part                
Debt Instrument [Line Items]                
Redemption price (as a percent)       100.00%        
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes | Redeemable Rate Upon Change of Control                
Debt Instrument [Line Items]                
Redemption price (as a percent)       101.00%        
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes | Redeemable Rate Upon Certain Asset Sales                
Debt Instrument [Line Items]                
Redemption price (as a percent)       100.00%