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LONG-TERM DEBT - Senior Unsecured Notes (Details) - USD ($)
Aug. 11, 2015
Sep. 30, 2015
Sep. 10, 2015
Sep. 30, 2014
Aug. 31, 2013
Mar. 31, 2012
Debt Instrument [Line Items]            
Amount of debt repurchased $ 175,000,000.0          
Accrued interest   $ 12,055,000   $ 8,659,000    
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes            
Debt Instrument [Line Items]            
Loan face amount         $ 500,000,000  
Note stated interest rate   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   10.03%        
Redeemable rate         100.00%  
Redeemable rate after cutoff upon change of control         101.00%  
Redeemable rate upon certain conditions         100.00%  
Accrued interest   $ 4,800,000   $ 4,100,000    
Senior Unsecured Notes | 2012 11 % Senior Subordinated Notes            
Debt Instrument [Line Items]            
Amount of debt repurchased     $ 175,000,000   $ 69,000,000  
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes            
Debt Instrument [Line Items]            
Loan face amount           $ 344,200,000.0
Note stated interest rate   11.00%   11.00%   11.00%
Effective interest rate of amounts outstanding   11.50%        
Redeemable rate           100.00%
Redeemable rate after cutoff upon change of control           101.00%
Redeemable rate upon certain conditions           100.00%
Accrued interest   $ 490,000   $ 1,300,000