Revenue Revenue by type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Sales	$ 967,391	$ 902,051
Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	495,062
Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	206,452
Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	149,421
Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	91,279
Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	25,177
North America [Member]
Disaggregation of Revenue [Line Items]
Sales	499,178
North America [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	172,811
North America [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	138,801
North America [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	119,673
North America [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	67,521
North America [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	372
Europe [Member]
Disaggregation of Revenue [Line Items]
Sales	292,401
Europe [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	184,452
Europe [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	38,953
Europe [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	23,009
Europe [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	21,182
Europe [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	24,805
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Sales	149,175
Asia Pacific [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	117,890
Asia Pacific [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	22,095
Asia Pacific [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	6,614
Asia Pacific [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	2,576
Asia Pacific [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	0
South America [Member]
Disaggregation of Revenue [Line Items]
Sales	26,637
South America [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	19,909
South America [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	6,603
South America [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	125
South America [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	0
South America [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 0