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Industry Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Segment	Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | Segment	2
Net sales	$ 282,378	$ 238,911
Operating Income	25,519	20,019
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	0	0
Engine Management [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net sales	211,314	180,681
Operating Income	27,285	24,204
Engine Management [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	7,312	4,872
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net sales	70,290	56,766
Operating Income	3,967	2,167
Temperature Control [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	2,029	1,594
All Other [Member]
Segment Reporting Information [Line Items]
Net sales	774	1,464
Operating Income	(5,733)	(6,352)
All Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	$ (9,341)	$ (6,466)

X

- Definition

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.

+ References

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ 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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