Revenue Recognition (Disaggregation of revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 890,051	$ 919,954
Original Equipment
Disaggregation of Revenue [Line Items]
Sales	419,850	464,617
Aftermarket
Disaggregation of Revenue [Line Items]
Sales	470,201	455,337
FPD
Disaggregation of Revenue [Line Items]
Sales	608,759	644,040
FPD | Original Equipment
Disaggregation of Revenue [Line Items]
Sales	205,803	254,083
FPD | Aftermarket
Disaggregation of Revenue [Line Items]
Sales	402,956	389,957
FCD
Disaggregation of Revenue [Line Items]
Sales	281,292	275,914
FCD | Original Equipment
Disaggregation of Revenue [Line Items]
Sales	214,047	210,534
FCD | Aftermarket
Disaggregation of Revenue [Line Items]
Sales	67,245	65,380
North America
Disaggregation of Revenue [Line Items]
Sales	382,946	383,283
North America | FPD
Disaggregation of Revenue [Line Items]
Sales	247,769	258,875
North America | FCD
Disaggregation of Revenue [Line Items]
Sales	135,177	124,408
Latin America
Disaggregation of Revenue [Line Items]
Sales	43,397	47,136
Latin America | FPD
Disaggregation of Revenue [Line Items]
Sales	37,601	41,467
Latin America | FCD
Disaggregation of Revenue [Line Items]
Sales	5,796	5,669
Middle East And Africa
Disaggregation of Revenue [Line Items]
Sales	97,257	119,093
Middle East And Africa | FPD
Disaggregation of Revenue [Line Items]
Sales	74,366	86,044
Middle East And Africa | FCD
Disaggregation of Revenue [Line Items]
Sales	22,891	33,049
Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	171,140	184,342
Asia Pacific | FPD
Disaggregation of Revenue [Line Items]
Sales	113,948	128,120
Asia Pacific | FCD
Disaggregation of Revenue [Line Items]
Sales	57,192	56,222
Europe
Disaggregation of Revenue [Line Items]
Sales	195,311	186,100
Europe | FPD
Disaggregation of Revenue [Line Items]
Sales	135,075	129,534
Europe | FCD
Disaggregation of Revenue [Line Items]
Sales	$ 60,236	$ 56,566