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Details of Selected Balance Sheet Accounts (Tables)

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accounts Receivable, Net

Additional information regarding selected balance sheet accounts as of June 30, 2023 and December 31, 2022 is presented below (in thousands):

			June 30, 2023						December 31, 2022
Accounts receivable, net:
Trade			$	131,726					$	145,540
Unbilled revenue			26,796						29,679
Contract assets			23,714						42,599
Other			3,754						6,177
Total accounts receivable			185,990						223,995
Allowance for doubtful accounts			(5,073)						(5,226)
			$	180,917					$	218,769
Allowance for doubtful accounts as a percentage of total accounts receivable			3		%				2		%

Schedule of Contract with Customer, Asset and Liability

			June 30, 2023						December 31, 2022
Deferred revenue (contract liabilities)			$	53,027					$	44,790

Schedule 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, 2023 and 2022 (in thousands):

			Six Months Ended June 30,
			2023						2022
Allowance for doubtful accounts – January 1			$	5,226					$	4,471
Provisions			14						1,044
Write-offs			(204)						(629)
Other			37						280
Allowance for doubtful accounts – June 30			$	5,073					$	5,166

Schedule of Inventory, Net

			June 30, 2023						December 31, 2022
Inventories, net:
Finished goods and purchased products			$	103,641					$	90,443
Work in process			33,431						32,079
Raw materials			107,781						97,817
Total inventories			244,853						220,339
Allowance for excess or obsolete inventory			(39,721)						(37,681)
			$	205,132					$	182,658

Schedule of Property, Plant and Equipment, Net

									June 30, 2023						December 31, 2022
Property, plant and equipment, net:
Property, plant and equipment						$	1,054,155					$	1,128,834
Accumulated depreciation						(758,140)						(824,999)
																					$	296,015					$	303,835

Schedule of Finite-Lived Intangible Assets

			June 30, 2023																		December 31, 2022
			Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount						Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount
Other intangible assets:
Customer relationships			$	141,313					$	52,069					$	89,244					$	141,179					$	47,629					$	93,550
Patents/Technology/Know-how			69,977						31,863						38,114						69,830						29,214						40,616
Tradenames and other			52,502						18,384						34,118						52,488						16,856						35,632
			$	263,792					$	102,316					$	161,476					$	263,497					$	93,699					$	169,798

Schedule of Other Noncurrent Assets

For the three months ended June 30, 2023 and 2022, amortization expense was $4.3 million and $5.3 million, respectively. Amortization expense was $8.6 million and $10.4 million for the six months ended June 30, 2023 and 2022, respectively.

			June 30, 2023						December 31, 2022
Other noncurrent assets:
Deferred compensation plan			$	19,231					$	17,551
Deferred financing costs			1,543						1,893
Deferred income taxes			2,351						1,517
Other			4,674						4,726
			$	27,799					$	25,687

Schedule of Accrued Liabilities

			June 30, 2023						December 31, 2022
Accrued liabilities:
Accrued compensation			$	21,742					$	33,659
Accrued taxes, other than income taxes			3,762						1,865
Insurance liabilities			4,150						4,640
Accrued interest			1,685						1,784
Accrued commissions			2,475						2,302
Other			9,173						4,807
			$	42,987					$	49,057

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