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LONG-TERM DEBT - Senior Unsecured Notes (Details) - USD ($)
1 Months Ended 9 Months Ended
Nov. 20, 2015
Aug. 31, 2015
Jun. 30, 2016
Nov. 30, 2015
Sep. 30, 2015
Aug. 31, 2013
Debt Instrument [Line Items]            
Accrued interest payable     $ 22,521,000   $ 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     9.75%   9.75% 9.75%
Proceeds from private placement   $ 85,000,000        
Amount outstanding   $ 585,000,000        
Redemption price as a percentage of principal           100.00%
Redeemable rate after cutoff           101.00%
Redeemable rate upon certain conditions           100.00%
Accrued interest payable     $ 19,000,000   $ 4,800,000  
Senior Unsecured Notes | 2015 Senior Unsecured Notes            
Debt Instrument [Line Items]            
Loan face amount $ 100,000,000          
Prepaid interest     $ 1,100,000      
Redemption price as a percentage of principal 100.00%          
Senior Unsecured Notes | 2015 Senior Unsecured Notes | If redeemed within one year            
Debt Instrument [Line Items]            
Premium rate on early redemption 0.25%          
Senior Unsecured Notes | 2015 Senior Unsecured Notes | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.45%   4.45%      
Variable rate at period end     0.65%      
Credit Facility | Facility Agreement for Senior Unsecured Notes            
Debt Instrument [Line Items]            
Borrowing capacity       $ 200,000,000