Industry Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2022 USD ($) Segment	Mar. 31, 2021 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]
Number of reportable operating segments | Segment		2
Net sales	[1]	$ 322,831	$ 276,553
Operating Income (Loss)		26,915	29,324
Intersegment Revenues [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	0	0
Engine Management [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	239,257	212,018
Operating Income (Loss)		26,716	31,114
Engine Management [Member] | Intersegment Revenues [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	5,789	5,359
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	81,321	62,473
Operating Income (Loss)		5,218	3,592
Temperature Control [Member] | Intersegment Revenues [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	3,216	1,847
All Other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	2,253	2,062
Operating Income (Loss)		(5,019)	(5,382)
All Other [Member] | Intersegment Revenues [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	$ (9,005)	$ (7,206)

[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.