Revenue Recognition (Disaggregation of revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Sales	$ 973,129	$ 877,063	$ 1,893,083	$ 1,743,381
Original Equipment
Disaggregation of Revenue [Line Items]
Sales	485,447	444,062	950,003	900,606
Aftermarket
Disaggregation of Revenue [Line Items]
Sales	487,682	433,001	943,080	842,775
EPD
Disaggregation of Revenue [Line Items]
Sales	471,178	419,439	927,967	836,509
EPD | Original Equipment
Disaggregation of Revenue [Line Items]
Sales	130,949	121,273	270,576	248,660
EPD | Aftermarket
Disaggregation of Revenue [Line Items]
Sales	340,229	298,166	657,391	587,849
IPD
Disaggregation of Revenue [Line Items]
Sales	196,291	182,953	383,542	352,955
IPD | Original Equipment
Disaggregation of Revenue [Line Items]
Sales	115,521	111,700	229,960	219,555
IPD | Aftermarket
Disaggregation of Revenue [Line Items]
Sales	80,770	71,253	153,582	133,400
FCD
Disaggregation of Revenue [Line Items]
Sales	305,660	274,671	581,574	553,917
FCD | Original Equipment
Disaggregation of Revenue [Line Items]
Sales	238,977	211,089	449,467	432,391
FCD | Aftermarket
Disaggregation of Revenue [Line Items]
Sales	66,683	63,582	132,107	121,526
North America
Disaggregation of Revenue [Line Items]
Sales	397,814	361,189	781,708	703,748
North America | EPD
Disaggregation of Revenue [Line Items]
Sales	184,533	166,080	367,750	325,319
North America | IPD
Disaggregation of Revenue [Line Items]
Sales	79,717	75,177	155,679	145,324
North America | FCD
Disaggregation of Revenue [Line Items]
Sales	133,564	119,932	258,279	233,105
Latin America
Disaggregation of Revenue [Line Items]
Sales	48,993	42,010	96,128	96,439
Latin America | EPD
Disaggregation of Revenue [Line Items]
Sales	37,054	29,721	70,835	63,082
Latin America | IPD
Disaggregation of Revenue [Line Items]
Sales	6,620	6,946	14,302	14,062
Latin America | FCD
Disaggregation of Revenue [Line Items]
Sales	5,319	5,343	10,991	19,295
Middle East And Africa
Disaggregation of Revenue [Line Items]
Sales	107,856	87,561	217,739	202,913
Middle East And Africa | EPD
Disaggregation of Revenue [Line Items]
Sales	62,495	46,410	124,183	119,138
Middle East And Africa | IPD
Disaggregation of Revenue [Line Items]
Sales	12,375	12,659	27,511	26,388
Middle East And Africa | FCD
Disaggregation of Revenue [Line Items]
Sales	32,986	28,492	66,045	57,387
Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	214,970	180,645	399,268	328,292
Asia Pacific | EPD
Disaggregation of Revenue [Line Items]
Sales	112,293	99,599	220,376	180,211
Asia Pacific | IPD
Disaggregation of Revenue [Line Items]
Sales	26,287	24,010	46,319	46,449
Asia Pacific | FCD
Disaggregation of Revenue [Line Items]
Sales	76,390	57,036	132,573	101,632
Europe
Disaggregation of Revenue [Line Items]
Sales	203,496	205,658	398,240	411,989
Europe | EPD
Disaggregation of Revenue [Line Items]
Sales	74,803	77,629	144,823	148,759
Europe | IPD
Disaggregation of Revenue [Line Items]
Sales	71,292	64,161	139,731	120,732
Europe | FCD
Disaggregation of Revenue [Line Items]
Sales	$ 57,401	$ 63,868	$ 113,686	$ 142,498