Net Sales (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	$ 1,128,588	$ 1,137,913	$ 1,092,051
Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	949,539	961,689	940,462
OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	159,012	152,580	127,480
Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	20,037	23,644	24,109
Ignition, Emission Control, Fuel and Safety Related System Products [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	699,894	712,375	654,099
Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	144,122	143,644	155,671
Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	163,883	161,823	150,269
Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	120,689	120,071	132,012
United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	1,007,201	1,023,903	976,030
Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	48,470	50,158	57,460
Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	19,607	20,035	20,214
Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	35,244	24,968	18,148
Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	12,606	13,875	13,684
Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	5,460	4,974	6,515
Engine Management [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	835,685	849,161	803,487
Engine Management [Member] | Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	682,874	702,872	684,242
Engine Management [Member] | OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	133,942	124,665	97,205
Engine Management [Member] | Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	18,869	21,624	22,040
Engine Management [Member] | Ignition, Emission Control, Fuel and Safety Related System Products [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	691,722	705,994	648,270
Engine Management [Member] | Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	143,963	143,167	155,217
Engine Management [Member] | Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	0	0	0
Engine Management [Member] | Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	0	0	0
Engine Management [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	738,521	760,134	714,402
Engine Management [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	25,842	27,439	33,475
Engine Management [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	19,336	19,330	19,397
Engine Management [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	35,079	24,838	17,869
Engine Management [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	12,255	13,341	13,054
Engine Management [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	4,652	4,079	5,290
Temperature Control [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	281,954	278,355	278,456
Temperature Control [Member] | Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	255,716	248,420	246,112
Temperature Control [Member] | OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	25,070	27,915	30,275
Temperature Control [Member] | Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	1,168	2,020	2,069
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
Temperature Control [Member] | Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	0	0	0
Temperature Control [Member] | Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	163,071	160,485	148,416
Temperature Control [Member] | Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	118,883	117,870	130,040
Temperature Control [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	268,680	263,769	261,628
Temperature Control [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	11,679	12,322	13,877
Temperature Control [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	271	705	817
Temperature Control [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	165	130	279
Temperature Control [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	351	534	630
Temperature Control [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1]	808	895	1,225
Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	10,949	10,397	10,108
Other [Member] | Aftermarket [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	10,949	10,397	10,108
Other [Member] | OE/OES [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0
Other [Member] | Export [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	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]	8,172	6,381	5,829
Other [Member] | Wire and Cable [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	159	477	454
Other [Member] | Compressors [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	812	1,338	1,853
Other [Member] | Other Climate Control Parts [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	1,806	2,201	1,972
Other [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0
Other [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	10,949	10,397	10,108
Other [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0
Other [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0
Other [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	0	0	0
Other [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	[1],[2]	$ 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.