FAIR VALUE MEASUREMENTS - Summary of Fair Value Level 3 Debt Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loan	$ 425,856	$ 429,143
Revolving credit facility	20,000	0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loan	262,966	428,071
Revolving credit facility	$ 12,350	$ 0