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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets
Amortization expense attributable to intangible assets	$ 4,900	$ 9,100	$ 6,900
Original Cost	12,123	43,674
Accumulated Amortization	(6,117)	(34,005)
Intangibles, Net	6,006	9,669
Estimated amortization expense attributable to intangible assets
2021	2,831
2022	1,600
2023	647
2024	66
2025	66
Thereafter	795
Noncompete agreement
Intangible Assets
Original Cost		9,803
Accumulated Amortization		(9,440)
Intangibles, Net		363
Customer contracts, net
Intangible Assets
Original Cost	10,623	32,371
Accumulated Amortization	(5,744)	(24,258)
Intangibles, Net	4,879	8,113
Permits
Intangible Assets
Original Cost	1,500	1,500
Accumulated Amortization	(373)	(307)
Intangibles, Net	$ 1,127	$ 1,193

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 for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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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