Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	$ 105,809	$ 105,901
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	67,321	67,413
Goodwill foreign currency exchange rate change	80	(92)
Goodwill gross, ending balance	116,290	105,809
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	77,802	67,321
Pollak business of Stoneridge, Inc. [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition	10,401
Engine Management [Member]
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	91,539	91,631
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	53,051	53,143
Goodwill foreign currency exchange rate change	80	(92)
Goodwill gross, ending balance	102,020	91,539
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	63,532	53,051
Engine Management [Member] | Pollak business of Stoneridge, Inc. [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition	10,401
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
Temperature Control [Member] | Pollak business of Stoneridge, Inc. [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition	$ 0