Business Segments - Product line information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Revenues	$ 937,914	$ 869,016	$ 909,145	$ 902,051	$ 875,434	$ 855,656	$ 879,304	$ 862,497	$ 3,618,126	$ 3,472,891	$ 3,342,804
Sealing systems [Member]
Revenue from External Customer [Line Items]
Revenues									1,908,852	1,816,924	1,783,068
Fuel and brake delivery systems [Member]
Revenue from External Customer [Line Items]
Revenues									757,198	725,689	675,493
Fluid transfer systems [Member]
Revenue from External Customer [Line Items]
Revenues									521,553	494,940	458,699
Anti-vibration systems [Member]
Revenue from External Customer [Line Items]
Revenues									326,684	301,199	278,891
Other products [Member]
Revenue from External Customer [Line Items]
Revenues									$ 103,839	$ 134,139	$ 146,653