Inventories (Tables)

12 Months Ended

Dec. 31, 2021

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories at December 31 consisted of the following (in thousands):

	2021		2020
Raw material	$	135,558	$	66,018
Work-in-process	5,858		5,382
Finished goods	39,256		31,205
Gross inventory	$	180,672	$	102,605
Less reserves	(4,465)		(4,298)
Total inventories	$	176,207	$	98,307

Summary of Activity within the Reserve for Excess, Obsolete, and Slow Moving Inventory

The following table summarizes activity recorded within the reserve for excess, obsolete and slow moving inventory for the years ended December 31 (in thousands):

	2021		2020		2019
Beginning balance	$	4,161	$	3,463	$	2,971
Excess, obsolete and slow moving inventory expense	215		355		1,134
Scrapped inventory and other adjustments	24		343		(642)
Ending balance	$	4,400	$	4,161	$	3,463