GOODWILL AND INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Intangible Assets, Net
Gross carrying amount	$ 259,016	$ 259,016
Accumulated amortization	(226,006)	(222,157)
Net book value	33,010	36,859
Customer related intangible assets
Intangible Assets, Net
Gross carrying amount	214,307	214,307
Accumulated amortization	(196,844)	(194,594)
Net book value	17,463	19,713
Operating agreement
Intangible Assets, Net
Gross carrying amount	35,000	35,000
Accumulated amortization	(22,166)	(20,854)
Net book value	12,834	14,146
Trademarks and trade names
Intangible Assets, Net
Gross carrying amount	9,709	9,709
Accumulated amortization	(6,996)	(6,709)
Net book value	$ 2,713	$ 3,000
Weighted Average | Customer related intangible assets
Intangible Assets, Net
Weighted average estimated useful life (in years)	9 years
Weighted Average | Operating agreement
Intangible Assets, Net
Weighted average estimated useful life (in years)	20 years
Weighted Average | Trademarks and trade names
Intangible Assets, Net
Weighted average estimated useful life (in years)	16 years