Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	$ 116,290	$ 105,809
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	77,802	67,321
Goodwill foreign currency exchange rate change	35	80
Goodwill gross, ending balance	116,325	116,290
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	77,837	77,802
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	102,020	91,539
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	63,532	53,051
Goodwill foreign currency exchange rate change	35	80
Goodwill gross, ending balance	102,055	102,020
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	63,567	63,532
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