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Details of Selected Balance Sheet Accounts (Tables)

3 Months Ended

Mar. 31, 2022

Details of Selected Balance Sheet Accounts [Abstract]

Schedule of Accounts Receivable, Net

Additional information regarding selected balance sheet accounts as of March 31, 2022 and December 31, 2021 is presented below (in thousands):

			March 31, 2022						December 31, 2021
Accounts receivable, net:
Trade			$	124,692					$	116,434
Unbilled revenue			24,368						24,389
Contract assets			39,937						39,755
Other			10,039						9,973
Total accounts receivable			199,036						190,551
Allowance for doubtful accounts			(4,779)						(4,471)
			$	194,257					$	186,080
Allowance for doubtful accounts as a percentage of total accounts receivable			2		%				2		%

Schedule of Contract with Customer, Asset and Liability

			March 31, 2022						December 31, 2021
Deferred revenue (contract liabilities)			$	47,560					$43,236

Summary of Activity in Allowance for Doubtful Accounts

The following provides a summary of activity in the allowance for doubtful accounts for the three months ended March 31, 2022 and 2021 (in thousands):

			Three Months Ended March 31,
			2022						2021
Allowance for doubtful accounts – January 1			$	4,471					$	8,304
Provisions			943						214
Write-offs			(635)						(116)
Other			—						143
Allowance for doubtful accounts – March 31			$	4,779					$	8,545

Schedule of Inventory, Net

			March 31, 2022						December 31, 2021
Inventories, net:
Finished goods and purchased products			$	91,215					$	87,934
Work in process			30,706						24,722
Raw materials			98,285						96,357
Total inventories			220,206						209,013
Allowance for excess or obsolete inventory			(39,320)						(40,440)
			$	180,886					$	168,573

Schedule of Property, Plant and Equipment, Net

									March 31, 2022						December 31, 2021
Property, plant and equipment, net:
Property, plant and equipment						$	1,140,743					$	1,151,533
Accumulated depreciation						(810,625)						(812,950)
																					$	330,118					$	338,583

Schedule of Finite-Lived Intangible Assets

			March 31, 2022																		December 31, 2021
			Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount						Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount
Other intangible assets:
Customer relationships			$	168,276					$	69,509					$	98,767					$	168,284					$	66,734					$	101,550
Patents/Technology/Know-how			78,815						34,679						44,136						78,821						33,151						45,670
Tradenames and other			53,682						15,946						37,736						53,708						15,179						38,529
			$	301,299					$	120,660					$	180,639					$	300,813					$	115,064					$	185,749

Schedule of Other Noncurrent Assets

			March 31, 2022						December 31, 2021
Other noncurrent assets:
Deferred compensation plan			$	21,607					$	23,348
Deferred financing costs			2,525						2,674
Deferred income taxes			1,341						1,878
Other			4,815						4,989
			$	30,288					$	32,889

Schedule of Accrued Liabilities

			March 31, 2022						December 31, 2021
Accrued liabilities:
Accrued compensation			$	16,586					$	20,904
Accrued taxes, other than income taxes			6,758						5,130
Insurance liabilities			5,231						6,361
Accrued interest			5,337						3,629
Accrued commissions			2,502						2,194
Other			5,127						5,183
			$	41,541					$	43,401

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