The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Intangible Assets, Net
Gross carrying amount	$ 262,712		$ 262,712		$ 264,957
Accumulated amortization	(213,010)		(213,010)		(203,911)
Net book value	49,702		49,702		61,046
Amortization expense for definite lived intangible assets	4,295	$ 3,298	11,344	$ 15,489
2020	14,900		14,900
2021	9,300		9,300
2022	5,100		5,100
2023	5,100		5,100
2024	5,100		5,100
Customer related intangible assets
Intangible Assets, Net
Gross carrying amount	214,973		214,973		214,973
Accumulated amortization	(185,089)		(185,089)		(176,043)
Net book value	29,884		29,884		38,930
Operating agreement
Intangible Assets, Net
Gross carrying amount	35,000		35,000		35,000
Accumulated amortization	(18,689)		(18,689)		(17,376)
Net book value	16,311		16,311		17,624
Trademarks and trade names
Intangible Assets, Net
Gross carrying amount	9,709		9,709		9,709
Accumulated amortization	(6,202)		(6,202)		(5,893)
Net book value	3,507		3,507		3,816
Non-compete agreements
Intangible Assets, Net
Gross carrying amount	1,230		1,230		1,230
Accumulated amortization	(1,230)		(1,230)		(1,215)
Net book value	0		0		15
Intellectual property
Intangible Assets, Net
Gross carrying amount	0		0		300
Accumulated amortization	0		0		(175)
Net book value	0		0		125
Other intangible assets
Intangible Assets, Net
Gross carrying amount	1,800		1,800		3,745
Accumulated amortization	(1,800)		(1,800)		(3,209)
Net book value	$ 0		$ 0		$ 536
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
Weighted Average \| Non-compete agreements
Intangible Assets, Net
Weighted average estimated useful life (in years)			4 years
Weighted Average \| Intellectual property
Intangible Assets, Net
Weighted average estimated useful life (in years)			0 years
Weighted Average \| Other intangible assets
Intangible Assets, Net
Weighted average estimated useful life (in years)			5 years