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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible Assets
Amortization expense attributable to intangible assets	$ 9,100	$ 6,900	$ 10,500
Original Cost	43,674	34,197
Accumulated Amortization	(34,005)	(24,919)
Intangibles, Net	9,669	9,278
Estimated amortization expense attributable to intangible assets
2020	4,495
2021	2,952
2022	647
2023	647
2024	66
Thereafter	862
Noncompete agreement
Intangible Assets
Original Cost	9,803	9,697
Accumulated Amortization	(9,440)	(8,385)
Intangibles, Net	363	1,312
Customer contracts, net
Intangible Assets
Original Cost	32,371	23,000
Accumulated Amortization	(24,258)	(16,293)
Intangibles, Net	8,113	6,707
Permits
Intangible Assets
Original Cost	1,500	1,500
Accumulated Amortization	(307)	(241)
Intangibles, Net	$ 1,193	$ 1,259

X

- Definition

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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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