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Industry Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Segment	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | Segment			2
Net sales	$ 300,795	$ 270,037	$ 828,683	$ 767,008
Operating Income	33,574	29,957	85,437	66,184
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Engine Management [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net sales	200,782	176,379	580,311	530,442
Operating Income	29,745	24,740	84,497	68,295
Engine Management [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	5,189	4,381	15,878	14,434
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net sales	96,819	90,625	241,088	228,432
Operating Income	9,283	8,964	17,097	10,710
Temperature Control [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	2,354	2,027	6,069	5,396
All Other [Member]
Segment Reporting Information [Line Items]
Net sales	3,194	3,033	7,284	8,134
Operating Income	(5,454)	(3,747)	(16,157)	(12,821)
All Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	$ (7,543)	$ (6,408)	$ (21,947)	$ (19,830)

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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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