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LONG-TERM DEBT - Senior Subordinated Notes (Details) - USD ($)
Sep. 30, 2015
Sep. 10, 2015
Aug. 11, 2015
Sep. 30, 2014
Aug. 31, 2013
Mar. 31, 2012
Feb. 28, 2005
Debt Instrument [Line Items]              
Amount of debt repurchased     $ 175,000,000.0        
Accrued interest $ 12,055,000     $ 8,659,000      
Senior Subordinated Notes | 2005 6 7/8% Senior Subordinated Notes              
Debt Instrument [Line Items]              
Loan face amount             $ 150,000,000.0
Note stated interest rate       6.875%     6.875%
Principal amount tendered and exchanged           $ 140,300,000  
Debt outstanding $ 9,700,000            
Accrued interest       $ 83,000      
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes              
Debt Instrument [Line Items]              
Loan face amount           $ 344,200,000.0  
Note stated interest rate 11.00%     11.00%   11.00%  
Redeemable rate           100.00%  
Redeemable rate after cutoff upon change of control           101.00%  
Redeemable rate upon certain conditions           100.00%  
Payment in Kind (PIK) interest rate           2.00%  
Principal outstanding $ 100,200,000            
Effective interest rate of amounts outstanding 11.50%            
Accrued interest $ 490,000     $ 1,300,000      
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes | 2004 Senior Subordinated Notes              
Debt Instrument [Line Items]              
Principal amount tendered and exchanged           $ 203,800,000  
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes | 2005 Senior Subordinated Notes              
Debt Instrument [Line Items]              
Principal amount tendered and exchanged           $ 140,300,000  
Senior Unsecured Notes | 2012 11 % Senior Subordinated Notes              
Debt Instrument [Line Items]              
Amount of debt repurchased   $ 175,000,000     $ 69,000,000