BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Aug. 31, 2013	Mar. 31, 2012
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate (as a percent)	9.75%	9.75%
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate (as a percent)	11.00%		11.00%
Fair Value, Inputs, Level 2 | Senior Unsecured Notes | 2015 Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	$ 14,700
Carrying Value | Fair Value, Inputs, Level 2 | Credit Facility | Term Loan A Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	387,523
Carrying Value | Fair Value, Inputs, Level 2 | Credit Facility | Term Loan B Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	761,039
Carrying Value | Fair Value, Inputs, Level 2 | Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	487,617
Carrying Value | Fair Value, Inputs, Level 2 | Senior Unsecured Notes | 2015 Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	$ 13,017
Carrying Value | Fair Value, Inputs, Level 2 | Senior Subordinated Notes | 2013 9 3/4% Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate (as a percent)	9.75%
Carrying Value | Fair Value, Inputs, Level 2 | Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate (as a percent)	11.00%
Fair Value | Fair Value, Inputs, Level 2 | Credit Facility | Term Loan A Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	$ 396,912
Fair Value | Fair Value, Inputs, Level 2 | Credit Facility | Term Loan B Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	785,930
Fair Value | Fair Value, Inputs, Level 2 | Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	$ 534,375