Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning of period		$ 910,088	$ 902,579
Acquisitions			5,053
Foreign currency translation		(5,050)	2,456
Purchase price adjustment (1)	[1]	(53)
Goodwill, end of period		904,985	910,088
Production & Automation Technologies
Goodwill [Roll Forward]
Goodwill, beginning of period		808,952	801,443
Acquisitions			5,053
Foreign currency translation		(5,050)	2,456
Purchase price adjustment (1)	[1]	(53)
Goodwill, end of period		803,849	808,952
Drilling Technologies
Goodwill [Roll Forward]
Goodwill, beginning of period		101,136	101,136
Goodwill, end of period		$ 101,136	$ 101,136

[1] Purchase price adjustment related to our 2017 acquisition of PCP Oil Tools S.A. and Ener Tools S.A.