Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Allowances for Doubtful Accounts Table

	Year Ended December 31,
	2018			2017			2016
	(In Thousands)
At beginning of period	$	1,286		$	3,872		$	6,279
Activity in the period:
Provision for doubtful accounts	2,156			1,428			2,436
Account (chargeoffs) recoveries	(859		)	(4,014		)	(4,843		)
At end of period	$	2,583		$	1,286		$	3,872

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 are as follows:

	December 31,
	2018		2017
	(In Thousands)
Finished goods	$	69,762	$	66,377
Raw materials	3,503		4,027
Parts and supplies	47,386		33,632
Work in progress	22,920		11,402
Total inventories	$	143,571	$	115,438

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 in the CCLP 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