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
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Intangible Assets, Net
Gross carrying amount	$ 271,421		$ 324,796
Accumulated amortization	(199,261)		(233,143)
Net book value	72,160		91,653
Amortization expense for definite lived intangible assets	8,647	$ 7,147
2019	19,600
2020	13,300
2021	10,600
2022	5,300
2023	5,300
Customer related intangible assets
Intangible Assets, Net
Gross carrying amount	219,797		273,172
Accumulated amortization	(172,892)		(207,639)
Net book value	46,905		65,533
Operating agreement
Intangible Assets, Net
Gross carrying amount	35,000		35,000
Accumulated amortization	(16,064)		(15,632)
Net book value	18,936		19,368
Trademarks and trade names
Intangible Assets, Net
Gross carrying amount	11,349		11,349
Accumulated amortization	(6,412)		(6,244)
Net book value	4,937		5,105
Non-compete agreements
Intangible Assets, Net
Gross carrying amount	1,230		1,230
Accumulated amortization	(1,103)		(1,026)
Net book value	127		204
Intellectual property
Intangible Assets, Net
Gross carrying amount	300		300
Accumulated amortization	(145)		(145)
Net book value	155		155
Other intangible assets
Intangible Assets, Net
Gross carrying amount	3,745		3,745
Accumulated amortization	(2,645)		(2,457)
Net book value	$ 1,100		$ 1,288
Weighted Average \| Customer related intangible assets
Intangible Assets, Net
Weighted average estimated useful life (in years)	8 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)	15 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)	10 years
Weighted Average \| Other intangible assets
Intangible Assets, Net
Weighted average estimated useful life (in years)	5 years