DEBT - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 422,757
Term Loan Facilities
Debt Instrument [Line Items]
Long-term Debt	222,757	$ 222,757
2021 Notes
Debt Instrument [Line Items]
Long-term Debt	196,038	$ 195,462
Term loan facilities and 2021 notes
Debt Instrument [Line Items]
Long-term Debt	418,795
Fair Value | Fair Value, Inputs, Level 1 | Term Loan Facilities
Debt Instrument [Line Items]
Long-term Debt	0
Fair Value | Fair Value, Inputs, Level 1 | 2021 Notes
Debt Instrument [Line Items]
Long-term Debt	0
Fair Value | Fair Value, Inputs, Level 1 | Term loan facilities and 2021 notes
Debt Instrument [Line Items]
Long-term Debt	0
Fair Value | Fair Value, Inputs, Level 2 | Term Loan Facilities
Debt Instrument [Line Items]
Long-term Debt	196,500
Fair Value | Fair Value, Inputs, Level 2 | 2021 Notes
Debt Instrument [Line Items]
Long-term Debt	167,650
Fair Value | Fair Value, Inputs, Level 2 | Term loan facilities and 2021 notes
Debt Instrument [Line Items]
Long-term Debt	364,150
Fair Value | Fair Value, Inputs, Level 3 | Term Loan Facilities
Debt Instrument [Line Items]
Long-term Debt	0
Fair Value | Fair Value, Inputs, Level 3 | 2021 Notes
Debt Instrument [Line Items]
Long-term Debt	0
Fair Value | Fair Value, Inputs, Level 3 | Term loan facilities and 2021 notes
Debt Instrument [Line Items]
Long-term Debt	$ 0