Net Sales (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	$ 370,310	$ 343,609	$ 988,939	$ 845,850
Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	292,658	298,994	792,559	716,020
OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	70,243	39,991	174,855	115,937
Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	7,409	4,624	21,525	13,893
Ignition, Emission Control, Fuel and Safety Related System Products [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	210,692	192,936	580,345	503,574
Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	38,666	38,801	117,613	105,751
Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	76,264	71,463	179,619	142,040
Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	44,688	40,409	111,362	94,485
United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	324,698	311,275	868,049	757,191
Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	18,381	14,738	46,797	35,385
Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	12,304	8,117	31,530	25,931
Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	6,481	5,108	19,269	14,731
Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	7,014	2,701	17,632	8,773
Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	1,432	1,670	5,662	3,839
Engine Management [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	247,151	229,554	692,385	603,825
Engine Management [Member] | Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	178,181	191,844	520,183	493,903
Engine Management [Member] | OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	62,043	33,369	152,171	96,840
Engine Management [Member] | Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	6,927	4,341	20,031	13,082
Engine Management [Member] | Ignition, Emission Control, Fuel and Safety Related System Products [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	208,443	190,891	574,595	498,204
Engine Management [Member] | Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	38,708	38,663	117,790	105,621
Engine Management [Member] | Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	0	0	0	0
Engine Management [Member] | Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	0	0	0	0
Engine Management [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	210,639	204,537	594,014	532,807
Engine Management [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	9,731	7,860	25,738	18,974
Engine Management [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	12,269	8,116	31,351	25,791
Engine Management [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	6,381	5,016	18,988	14,539
Engine Management [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	6,900	2,634	17,301	8,508
Engine Management [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	1,231	1,391	4,993	3,206
Temperature Control [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	119,075	110,393	288,019	234,227
Temperature Control [Member] | Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	110,393	103,488	263,841	214,319
Temperature Control [Member] | OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	8,200	6,622	22,684	19,097
Temperature Control [Member] | Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	482	283	1,494	811
Temperature Control [Member] | Ignition, Emission Control, Fuel and Safety Related System Products [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	0	0	0	0
Temperature Control [Member] | Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	0	0	0	0
Temperature Control [Member] | Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	75,080	70,785	178,031	141,011
Temperature Control [Member] | Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	43,995	39,608	109,988	93,216
Temperature Control [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	114,059	106,738	274,035	224,384
Temperature Control [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	4,566	3,216	12,524	8,613
Temperature Control [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	35	1	179	140
Temperature Control [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	100	92	281	192
Temperature Control [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	114	67	331	265
Temperature Control [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	201	279	669	633
Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	4,084	3,662	8,535	7,798
Other [Member] | Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	4,084	3,662	8,535	7,798
Other [Member] | OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0	0
Other [Member] | Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0	0
Other [Member] | Ignition, Emission Control, Fuel and Safety Related System Products [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	2,249	2,045	5,750	5,370
Other [Member] | Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	(42)	138	(177)	130
Other [Member] | Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	1,184	678	1,588	1,029
Other [Member] | Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	693	801	1,374	1,269
Other [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0	0
Other [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	4,084	3,662	8,535	7,798
Other [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0	0
Other [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0	0
Other [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0	0
Other [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	$ 0	$ 0	$ 0	$ 0

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

[2] Other consists of the elimination of intersegment sales from our Engine Management and Temperature Control segments as well as sales from our Canadian business unit that does not meet the criteria of a reportable operating segment. Intersegment wire and cable sales for the three months and nine months ended September 30, 2021 exceeded third party sales from our Canadian business unit.