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Details of Selected Balance Sheet Accounts (Tables)

6 Months Ended

Jun. 30, 2021

Details of Selected Balance Sheet Accounts [Abstract]

Schedule of Accounts Receivable, Net

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

			June 30, 2021						December 31, 2020
Accounts receivable, net:
Trade			$	125,332					$	109,294
Unbilled revenue			23,813						23,173
Contract assets			18,074						35,870
Other			10,903						3,102
Total accounts receivable			178,122						171,439
Allowance for doubtful accounts			(7,698)						(8,304)
			$	170,424					$	163,135
Allowance for doubtful accounts as a percentage of total accounts receivable			4		%				5		%

Contract with Customer, Asset and Liability

			June 30, 2021						December 31, 2020
Deferred revenue (contract liabilities)			$	45,210					$	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 six months ended June 30, 2021 and 2020 (in thousands):

			Six Months Ended June 30,
			2021						2020
Allowance for doubtful accounts – January 1			$	8,304					$	8,745
Provisions			61						2,549
Write-offs			(815)						(2,184)
Other			148						1,152
Allowance for doubtful accounts – June 30			$	7,698					$	10,262

Schedule of Inventory, Net

			June 30, 2021						December 31, 2020
Inventories, net:
Finished goods and purchased products			$	90,623					$	88,634
Work in process			30,248						27,063
Raw materials			93,968						95,410
Total inventories			214,839						211,107
Allowance for excess or obsolete inventory			(39,790)						(40,731)
			$	175,049					$	170,376

Schedule of Property, Plant and Equipment, Net

									June 30, 2021						December 31, 2020
Property, plant and equipment, net:
Land						$	34,661					$	34,968
Buildings and leasehold improvements																					265,793						267,072
Machinery and equipment																					242,849						239,986
Completion-related rental equipment																					505,795						507,755
Office furniture and equipment																					32,329						35,767
Vehicles																					77,415						81,607
Construction in progress						5,879						7,207
Total property, plant and equipment						1,164,721						1,174,362
Accumulated depreciation						(809,316)						(790,800)
																					$	355,405					$	383,562

Schedule of Finite-Lived Intangible Assets

			June 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			$	168,290					$	60,937					$	107,353					$	168,288					$	55,380					$	112,908
Patents/Technology/Know-how			78,528						30,425						48,103						75,920						26,124						49,796
Noncompete agreements			—						—						—						16,044						14,742						1,302
Tradenames and other			53,708						13,552						40,156						53,708						11,965						41,743
			$	300,526					$	104,914					$	195,612					$	313,960					$	108,211					$	205,749

Schedule of Other Noncurrent Assets

			June 30, 2021						December 31, 2020
Other noncurrent assets:
Deferred compensation plan			$	24,026					$	22,801
Deferred financing costs			3,097						—
Deferred income taxes			1,466						1,280
Other			5,159						5,646
			$	33,748					$	29,727

Schedule of Accrued Liabilities

			June 30, 2021						December 31, 2020
Accrued liabilities:
Accrued compensation			$	16,840					$	18,463
Accrued taxes, other than income taxes			11,029						7,307
Insurance liabilities			6,677						7,694
Accrued interest			3,605						2,202
Accrued commissions			1,263						1,416
Other			5,974						7,422
			$	45,388					$	44,504

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