FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details) $ in Thousands	Mar. 09, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Liabilities, Fair Value Disclosure [Abstract]
Contingent Consideration		$ 8,397
Performance period	2 years
Podcorn
Liabilities, Fair Value Disclosure [Abstract]
Contingent Consideration	$ 7,700
Performance period	2 years
Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow
Liabilities, Fair Value Disclosure [Abstract]
Discount rate (percent)	0.105	0.095
Other Long Term Liabilities
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities		$ 31,193	$ 33,474
Interest Rate Cash Flow Hedge		1,173	2,439
Quoted prices in active markets Level 1
Liabilities, Fair Value Disclosure [Abstract]
Contingent Consideration		0
Quoted prices in active markets Level 1 | Other Long Term Liabilities
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities		25,119	27,040
Interest Rate Cash Flow Hedge		0	0
Significant other observable inputs Level 2
Liabilities, Fair Value Disclosure [Abstract]
Contingent Consideration		0
Significant other observable inputs Level 2 | Other Long Term Liabilities
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities		0	0
Interest Rate Cash Flow Hedge		1,173	2,439
Significant unobservable inputs Level 3
Liabilities, Fair Value Disclosure [Abstract]
Contingent Consideration		8,397
Significant unobservable inputs Level 3 | Other Long Term Liabilities
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities		0	0
Interest Rate Cash Flow Hedge		0	0
Fair Value Measured at Net Asset Value
Liabilities, Fair Value Disclosure [Abstract]
Contingent Consideration		0
Fair Value Measured at Net Asset Value | Other Long Term Liabilities
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities		6,074	6,434
Interest Rate Cash Flow Hedge		$ 0	$ 0