Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Accounts Receivable, Doubtful Accounts Table

The allowance for doubtful accounts is determined on a specific identification basis when we believe that the collection of specific amounts owed to us is not probable. Changes in the allowance are as follows:

	Year Ended December 31,
	2021		2020		2019
	(In Thousands)
At beginning of period	$	6,824	$	1,912	$	1,354
Activity in the period:
Provision for doubtful accounts	(4)		5,672		2,580
Account (charge offs) recoveries, net	(6,531)		(760)		(2,022)
At end of period	$	289	$	6,824	$	1,912

Property, Plant, and Equipment Table

Property, plant, and equipment are stated at cost. Expenditures that increase the useful lives of assets are capitalized. The cost of repairs and maintenance is charged to operations as incurred. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which are generally as follows:

Buildings	25 years
Machinery and equipment	3 – 10 years
Automobiles and trucks	4 – 5 years
Chemical plants	15 – 30 years

Schedule of Cash Flow, Supplemental Disclosures

Supplemental cash flow information from continuing and discontinued operations is as follows:

	Year Ended December 31,
	2021		2020		2019
	(in thousands)
Supplemental cash flow information(1):
Interest paid	$	14,347	$	63,935	$	68,332
Income taxes paid	2,100		5,633		7,274
Accrued capital expenditures at year end	7,491		1,573		3,625

(1) Prior-year information includes the activity for CSI Compressco for the full period. Current-year information includes activity for CSI Compressco for January only.