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Segment Information - Segment revenue and segment operating profit (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	$ 1,131,251	$ 1,218,156	$ 1,010,466
Interest expense, net									39,301	27,648	863
Income before income taxes									59,186	121,353	88,355
Production & Automation Technologies
Segment Reporting Information [Line Items]
Revenue									884,364	932,591	782,813
Reporting segments
Segment Reporting Information [Line Items]
Revenue									1,131,251	1,218,156	1,010,466
Operating profit									127,521	172,807	98,884
Reporting segments \| Production & Automation Technologies
Segment Reporting Information [Line Items]
Revenue									884,364	932,591	782,813
Operating profit									54,024	74,187	24,567
Reporting segments \| Drilling Technologies
Segment Reporting Information [Line Items]
Revenue									246,887	285,565	227,653
Operating profit									73,497	98,620	74,317
Corporate expense and other \| Corporate
Segment Reporting Information [Line Items]
Operating profit									$ 29,034	$ 23,806	$ 9,666