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Details of Selected Balance Sheet Accounts (Tables)

6 Months Ended

Jun. 30, 2022

Details of Selected Balance Sheet Accounts [Abstract]

Schedule of Accounts Receivable, Net

Additional information regarding selected balance sheet accounts as of June 30, 2022 and December 31, 2021 is presented below (in thousands):

			June 30, 2022						December 31, 2021
Accounts receivable, net:
Trade			$	135,121					$	116,434
Unbilled revenue			21,640						24,389
Contract assets			42,876						39,755
Other			9,916						9,973
Total accounts receivable			209,553						190,551
Allowance for doubtful accounts			(5,166)						(4,471)
			$	204,387					$	186,080
Allowance for doubtful accounts as a percentage of total accounts receivable			2		%				2		%

Schedule of Contract with Customer, Asset and Liability

			June 30, 2022						December 31, 2021
Deferred revenue (contract liabilities)			$	47,883					$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 six months ended June 30, 2022 and 2021 (in thousands):

			Six Months Ended June 30,
			2022						2021
Allowance for doubtful accounts – January 1			$	4,471					$	8,304
Provisions			1,044						61
Write-offs			(629)						(815)
Other			280						148
Allowance for doubtful accounts – June 30			$	5,166					$	7,698

Schedule of Inventory, Net

			June 30, 2022						December 31, 2021
Inventories, net:
Finished goods and purchased products			$	90,948					$	87,934
Work in process			31,464						24,722
Raw materials			94,558						96,357
Total inventories			216,970						209,013
Allowance for excess or obsolete inventory			(37,151)						(40,440)
			$	179,819					$	168,573

Schedule of Property, Plant and Equipment, Net

									June 30, 2022						December 31, 2021
Property, plant and equipment, net:
Property, plant and equipment						$	1,126,777					$	1,151,533
Accumulated depreciation						(811,879)						(812,950)
																					$	314,898					$	338,583

Schedule of Finite-Lived Intangible Assets

			June 30, 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			$	170,933					$	72,305					$	98,628					$	168,284					$	66,734					$	101,550
Patents/Technology/Know-how			79,872						36,234						43,638						78,821						33,151						45,670
Tradenames and other			54,158						16,833						37,325						53,708						15,179						38,529
			$	304,963					$	125,372					$	179,591					$	300,813					$	115,064					$	185,749

Schedule of Other Noncurrent Assets

			June 30, 2022						December 31, 2021
Other noncurrent assets:
Deferred compensation plan			$	19,015					$	23,348
Deferred financing costs			2,308						2,674
Deferred income taxes			1,269						1,878
Other			4,760						4,989
			$	27,352					$	32,889

Schedule of Accrued Liabilities

			June 30, 2022						December 31, 2021
Accrued liabilities:
Accrued compensation			$	20,924					$	20,904
Accrued taxes, other than income taxes			7,579						5,130
Insurance liabilities			5,073						6,361
Accrued interest			3,982						3,629
Accrued commissions			2,380						2,194
Other			6,406						5,183
			$	46,344					$	43,401

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Tabular disclosure of allowance for credit loss on accounts receivable.

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