FAIR VALUE MEASUREMENTS - Summary of fair value Level 3 debt - Term loan (Details 2) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loan	$ 293,250	$ 294,000
Revolving credit facility	32,500	31,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loan	299,000	303,000
Revolving credit facility	$ 31,800	$ 30,400