FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details) - Other Long Term Liabilities - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	$ 29,444	$ 33,229
Interest Rate Cash Flow Hedge	3,753	189
Quoted prices in active markets Level 1
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	23,388	25,592
Interest Rate Cash Flow Hedge	0	0
Significant other observable inputs Level 2
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	0	0
Interest Rate Cash Flow Hedge	3,753	189
Significant unobservable inputs Level 3
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	0	0
Interest Rate Cash Flow Hedge	0	0
Measured at Net Asset Value as a Practical Expedient
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	6,056	7,637
Interest Rate Cash Flow Hedge	$ 0	$ 0