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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Details of Selected Balance Sheet Accounts - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Goodwill [Line Items]
Goodwill						$ 764,601
Accumulated impairment losses						(282,295)
Changes in carrying value of goodwill
Goodwill, net, beginning of period		$ 482,306		$ 482,306
Goodwill impairment	$ 0	(406,056)	$ 0	(406,056)	$ 0
Foreign currency translation				(199)
Goodwill, net, end of period	76,051			76,051
Total Well Site Services
Goodwill [Line Items]
Goodwill						244,349
Accumulated impairment losses						(117,295)
Changes in carrying value of goodwill
Goodwill, net, beginning of period		127,054		127,054
Goodwill impairment				(127,054)
Foreign currency translation				0
Goodwill, net, end of period	0			0
Total Well Site Services \| Completion Services
Goodwill [Line Items]
Goodwill						221,582
Accumulated impairment losses						(94,528)
Changes in carrying value of goodwill
Goodwill, net, beginning of period		127,054		127,054
Goodwill impairment		(127,054)		(127,054)
Foreign currency translation				0
Goodwill, net, end of period	0			0
Total Well Site Services \| Drilling Services
Goodwill [Line Items]
Goodwill						22,767
Accumulated impairment losses						(22,767)
Changes in carrying value of goodwill
Goodwill, net, beginning of period		0		0
Goodwill impairment		0		0
Foreign currency translation				0
Goodwill, net, end of period	0			0
Downhole Technologies
Goodwill [Line Items]
Goodwill						357,502
Accumulated impairment losses						(165,000)
Changes in carrying value of goodwill
Goodwill, net, beginning of period		192,502		192,502
Goodwill impairment		(192,502)		(192,502)
Foreign currency translation				0
Goodwill, net, end of period	0			0
Offshore/ Manufactured Products
Goodwill [Line Items]
Goodwill						162,750
Accumulated impairment losses						$ 0
Changes in carrying value of goodwill
Goodwill, net, beginning of period		162,750		162,750
Goodwill impairment		$ (86,500)		(86,500)
Foreign currency translation				(199)
Goodwill, net, end of period	$ 76,051			$ 76,051