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Industry Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | Segment		2
Net sales	[1]	$ 261,826	$ 282,378
Operating Income		12,307	25,462
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	0	0
Engine Management [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	199,488	211,314
Operating Income		17,376	27,285
Engine Management [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	5,991	7,312
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	60,231	70,290
Operating Income		831	3,967
Temperature Control [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	1,680	2,029
All Other [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	2,107	774
Operating Income		(5,900)	(5,790)
All Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	$ (7,671)	$ (9,341)
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

X

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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