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SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2020

SIGNIFICANT ACCOUNTING POLICIES

Schedule of change in allowance for doubtful accounts

The change in the allowance for credit losses is as follows:

​	​	​	​	​	​	​	​	​	​
​	​	For the year ended December 31,
​	​	2020		​	2019			2018
​	​	(in thousands)
Balance at beginning of year	​	$	5,773		$	5,329		$	2,979
Increase to allowance based on a percent of revenue	​		1,212			2,641			2,253
Adjustment based on aged receivable analysis	​	​	5,161	​	​	(88)	​	​	(43)
Charge-offs	​		(3,003)			(2,504)			(23)
Recoveries	​	​	14			395			163
Balance at end of year	​	$	9,157		$	5,773		$	5,329

Schedule of estimated useful life of property and equipment

​

​	​	​
Asset Classification		Useful Life (years)
Land		Indefinite
Buildings and leasehold improvements		30 or lease term
Vehicles and equipment		4 - 7 or lease term
Machinery and equipment		2 - 15
Computer equipment and software		3 - 4 or lease term
Office furniture and equipment		7
Disposal wells		7 - 10
​	​	​

Summary of change in asset retirement obligations

​

​	​	​	​	​	​	​
​	​	For the year ended December 31,
​	​	2020			2019
​	​	(in thousands)
Balance at December 31, 2019	​	$	1,527		$	1,898
Accretion expense, included in depreciation and amortization expense	​	​	121		​	115
Disposals, included in depreciation and amortization expense	​	​	(272)		​	—
Payments	​	​	(377)	​	​	(486)
Balance at December 31, 2020	​	$	999		$	1,527

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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Tabular disclosure for determining the allowance for doubtful accounts for trade and other accounts receivable balances, and when impairments, charge-offs or recoveries are recognized.

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Tabular disclosure of useful life of physical assets used in the normal conduct of business and not intended for resale.

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