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Industry Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2020 USD ($) Segment	Mar. 31, 2019 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]
Number of reportable operating segments | Segment		2
Net sales	[1]	$ 254,302	$ 283,766
Operating Income (Loss)		14,323	17,957
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]	201,118	213,189
Operating Income (Loss)		21,433	22,344
Engine Management [Member] | Intersegment Revenues [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	4,014	5,349
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	51,442	68,924
Operating Income (Loss)		(348)	2,050
Temperature Control [Member] | Intersegment Revenues [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	1,391	1,933
All Other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	1,742	1,653
Operating Income (Loss)		(6,762)	(6,437)
All Other [Member] | Intersegment Revenues [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	$ (5,405)	$ (7,282)
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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