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PROPERTY AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2020

PROPERTY AND EQUIPMENT

Schedule of property and equipment

​

​	​	​	​	​	​	​	​
​		​	As of December 31,
​		​	2020			2019
​	​	​	(in thousands)
Machinery and equipment	​	​	$	596,441	​	$	659,835
Buildings and leasehold improvements	​	​		93,236	​		97,426
Pipelines	​	​	​	72,458	​	​	69,327
Disposal wells	​	​		48,097	​		64,149
Vehicles and equipment	​	​		30,975	​		53,819
Land	​	​	​	13,497	​	​	16,030
Computer equipment and software	​	​	​	7,127	​	​	8,051
Office furniture and equipment	​	​		892	​		1,157
Machinery and equipment - finance lease	​	​		537	​		162
Vehicles and equipment - finance lease	​	​		475	​		1,291
Computer equipment and software - finance lease	​	​		356	​		356
Other	​	​	​	—	​	​	497
Construction in progress	​	​		14,811	​		43,279
​	​	​		878,902	​		1,015,379
Less accumulated depreciation(1)	​	​		(528,537)	​		(562,986)
Property and equipment held-for-sale, net	​	​	​	—	​	​	885
Total property and equipment, net	​	​	$	350,365	​	$	453,278

(1) Includes $1.1 million and $1.6 million of accumulated depreciation related to finance leases as of December 31, 2020 and December 31, 2019, respectively.

Schedule of amortization of intangible assets

​

​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2020		​	2019			2018
​	​	(in thousands)
Category	​	​	​	​	​	​	​	​	​
Depreciation expense from property and equipment	​	$	89,848	​	$	107,738	​	$	119,114
Amortization expense from finance leases	​	​	314	​	​	916	​	​	1,314
Amortization expense from intangible assets	​	​	11,661	​	​	11,900	​	​	13,102
Accretion expense from asset retirement obligations	​	​	(151)	​	​	115	​	​	183
Total depreciation and amortization	​	$	101,672	​	$	120,669	​	$	133,713

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

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