Details of Selected Balance Sheet Accounts (Tables)

12 Months Ended

Dec. 31, 2019

Details of Selected Balance Sheet Accounts [Abstract]

Schedule of Accounts Receivable

Additional information regarding selected balance sheet accounts as of December 31, 2019 and 2018 is presented below (in thousands).

	2019			2018
Accounts receivable, net:
Trade	$	178,813		$	227,052
Unbilled revenue	28,341			35,674
Contract assets	26,034			21,201
Other	9,044			6,381
Total accounts receivable	242,232			290,308
Allowance for doubtful accounts	(8,745		)	(6,701		)
	$	233,487		$	283,607

Contract with Customer, Asset and Liability

	2019		2018
Deferred revenue (contract liabilities)	$	17,761	$	14,160

Schedule of Inventory

	2019			2018
Inventories, net:
Finished goods and purchased products	$	107,691		$	96,195
Work in process	21,963			20,552
Raw materials	110,719			111,197
Total inventories	240,373			227,944
Allowance for excess or obsolete inventory	(19,031		)	(18,551		)
	$	221,342		$	209,393

Property, Plant and Equipment

	Estimated Useful Life (in years)			2019			2018
Property, plant and equipment, net:
Land				$	37,507		$	37,545
Buildings and leasehold improvements	2	–	40	273,384			259,834
Machinery and equipment	1	–	28	246,826			483,629
Completion Services equipment	2	–	10	510,737			492,183
Office furniture and equipment	3	–	10	45,309			43,654
Vehicles	2	–	10	97,264			122,982
Construction in progress				13,281			29,451
Total property, plant and equipment				1,224,308			1,469,278
Accumulated depreciation				(764,584		)	(928,851		)
				$	459,724		$	540,427

Schedule of Other Noncurrent Assets

	2019		2018
Other noncurrent assets:
Deferred compensation plan	$	22,268	$	20,468
Deferred income taxes	685		761
Other	5,748		5,815
	$	28,701	$	27,044

Schedule of Accrued Liabilities

	2019		2018
Accrued liabilities:
Accrued compensation	$	24,930	$	29,867
Insurance liabilities	9,108		9,177
Accrued taxes, other than income taxes	3,424		4,530
Accrued commissions	1,481		1,484
Other	9,897		15,672
	$	48,840	$	60,730