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Details of Selected Balance Sheet Accounts (Tables)

9 Months Ended

Sep. 30, 2021

Details of Selected Balance Sheet Accounts [Abstract]

Schedule of Accounts Receivable, Net

Additional information regarding selected balance sheet accounts as of September 30, 2021 and December 31, 2020 is presented below (in thousands):

			September 30, 2021						December 31, 2020
Accounts receivable, net:
Trade			$	112,077					$	109,294
Unbilled revenue			21,523						23,173
Contract assets			22,428						35,870
Other			11,672						3,102
Total accounts receivable			167,700						171,439
Allowance for doubtful accounts			(6,260)						(8,304)
			$	161,440					$	163,135
Allowance for doubtful accounts as a percentage of total accounts receivable			4		%				5		%

Contract with Customer, Asset and Liability

			September 30, 2021						December 31, 2020
Deferred revenue (contract liabilities)			$	42,512					$	43,384

Summary of Activity in Allowance for Doubtful Accounts

The following provides a summary of activity in the allowance for doubtful accounts for the nine months ended September 30, 2021 and 2020 (in thousands):

			Nine Months Ended September 30,
			2021						2020
Allowance for doubtful accounts – January 1			$	8,304					$	8,745
Provisions			20						2,787
Write-offs			(2,200)						(2,490)
Other			136						1,158
Allowance for doubtful accounts – September 30			$	6,260					$	10,200

Schedule of Inventory, Net

			September 30, 2021						December 31, 2020
Inventories, net:
Finished goods and purchased products			$	90,558					$	88,634
Work in process			33,852						27,063
Raw materials			93,779						95,410
Total inventories			218,189						211,107
Allowance for excess or obsolete inventory			(40,111)						(40,731)
			$	178,078					$	170,376

Schedule of Property, Plant and Equipment, Net

									September 30, 2021						December 31, 2020
Property, plant and equipment, net:
Land						$	33,622					$	34,968
Buildings and leasehold improvements																					260,772						267,072
Machinery and equipment																					240,302						239,986
Completion-related rental equipment																					504,890						507,755
Office furniture and equipment																					32,936						35,767
Vehicles																					75,119						81,607
Construction in progress						8,059						7,207
Total property, plant and equipment						1,155,700						1,174,362
Accumulated depreciation						(815,316)						(790,800)
																					$	340,384					$	383,562

Schedule of Finite-Lived Intangible Assets

			September 30, 2021																		December 31, 2020
			Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount						Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount
Other intangible assets:
Customer relationships			$	168,283					$	63,956					$	104,327					$	168,288					$	55,380					$	112,908
Patents/Technology/Know-how			78,692						31,497						47,195						75,920						26,124						49,796
Noncompete agreements			—						—						—						16,044						14,742						1,302
Tradenames and other			53,708						14,385						39,323						53,708						11,965						41,743
			$	300,683					$	109,838					$	190,845					$	313,960					$	108,211					$	205,749

Schedule of Other Noncurrent Assets

			September 30, 2021						December 31, 2020
Other noncurrent assets:
Deferred compensation plan			$	24,609					$	22,801
Deferred financing costs			2,886						—
Deferred income taxes			1,281						1,280
Other			5,089						5,646
			$	33,865					$	29,727

Schedule of Accrued Liabilities

			September 30, 2021						December 31, 2020
Accrued liabilities:
Accrued compensation			$	22,072					$	18,463
Accrued taxes, other than income taxes			12,558						7,307
Insurance liabilities			6,684						7,694
Accrued interest			5,185						2,202
Accrued commissions			1,664						1,416
Other			5,268						7,422
			$	53,431					$	44,504

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