Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	$ 105,901	$ 105,719
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	67,413	67,231
Goodwill foreign currency exchange rate change	(92)	182
Goodwill gross, ending balance	105,809	105,901
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	67,321	67,413
Engine Management [Member]
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	91,631	91,449
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	53,143	52,961
Goodwill foreign currency exchange rate change	(92)	182
Goodwill gross, ending balance	91,539	91,631
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	53,051	53,143
Temperature Control [Member]
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	14,270	14,270
Goodwill accumulated impairment losses, Beginning balance	0	0
Goodwill net, beginning balance	14,270	14,270
Goodwill foreign currency exchange rate change	0	0
Goodwill gross, ending balance	14,270	14,270
Goodwill accumulated impairment losses, Ending balance	0	0
Goodwill net, ending balance	$ 14,270	$ 14,270