Revenue Revenue by type (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	$ 928,262	$ 909,145	$ 1,895,653	$ 1,811,196
Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	475,472		970,534
Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	206,176		412,628
Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	135,676		285,097
Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	87,552		178,831
Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	23,386		48,563
North America [Member]
Disaggregation of Revenue [Line Items]
Sales	477,608		976,786
North America [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	165,872		338,683
North America [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	139,308		278,109
North America [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	107,495		227,168
North America [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	64,751		132,272
North America [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	182		554
Europe [Member]
Disaggregation of Revenue [Line Items]
Sales	279,124		571,525
Europe [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	175,637		360,089
Europe [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	36,661		75,614
Europe [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	23,055		46,064
Europe [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	20,567		41,749
Europe [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	23,204		48,009
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Sales	147,994		297,169
Asia Pacific [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	116,484		234,374
Asia Pacific [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	24,234		46,329
Asia Pacific [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	5,042		11,656
Asia Pacific [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	2,234		4,810
Asia Pacific [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	0		0
South America [Member]
Disaggregation of Revenue [Line Items]
Sales	23,536		50,173
South America [Member] | Sealing systems [Member]
Disaggregation of Revenue [Line Items]
Sales	17,479		37,388
South America [Member] | Fuel and brake delivery systems [Member]
Disaggregation of Revenue [Line Items]
Sales	5,973		12,576
South America [Member] | Fluid transfer systems [Member]
Disaggregation of Revenue [Line Items]
Sales	84		209
South America [Member] | Anti-vibration systems [Member]
Disaggregation of Revenue [Line Items]
Sales	0		0
South America [Member] | Other products [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 0		$ 0