Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Allowances for Doubtful Accounts Table

	Year Ended December 31,
	2019			2018			2017
	(In Thousands)
At beginning of period	$	2,583		$	1,286		$	3,872
Activity in the period:
Provision for doubtful accounts	5,039			2,156			1,428
Account (chargeoffs) recoveries	(2,360		)	(859		)	(4,014		)
At end of period	$	5,262		$	2,583		$	1,286

Inventory Disclosure

Inventories are stated at the lower of cost or net realizable value. Except for work in progress inventory, cost is determined using the weighted average method. The cost of work in progress is determined using the specific identification method.

INVENTORIES

Components of inventories, net of reserve, are as follows:

	December 31,
	2019		2018
	(In Thousands)
Finished goods	$	70,135	$	69,762
Raw materials	4,125		3,503
Parts and supplies	47,793		47,386
Work in progress	14,457		22,920
Total inventories	$	136,510	$	143,571

Finished goods inventories include newly manufactured clear brine fluids as well as used brines that are repurchased from certain customers for recycling. Work in progress inventory consists primarily of new compressor packages located at our Compression Division fabrication facility in Midland, Texas.

Property, Plant, and Equipment Table

Buildings	15 – 40 years
Machinery and equipment	2 – 20 years
Automobiles and trucks	3 – 4 years
Chemical plants	15 – 30 years
Compressors	12 – 20 years