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Industry Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable operating segments			2
Net sales	$ 270,126	$ 268,875	$ 500,834	$ 480,586
Intersegment revenue	0	0	0	0
Operating income	27,220	22,690	43,250	32,393
Engine Management [Member]
Segment Reporting Information [Line Items]
Net sales	182,050	172,644	357,559	335,659
Intersegment revenue	7,566	4,358	13,019	8,846
Operating income	24,704	17,630	45,488	31,318
Temperature Control [Member]
Segment Reporting Information [Line Items]
Net sales	86,660	93,036	139,388	138,327
Intersegment revenue	1,546	1,527	3,055	2,636
Operating income	6,740	7,775	6,286	7,823
All Other [Member]
Segment Reporting Information [Line Items]
Net sales	1,416	3,195	3,887	6,600
Intersegment revenue	(9,112)	(5,885)	(16,074)	(11,482)
Operating income	$ (4,224)	$ (2,715)	$ (8,524)	$ (6,748)

X

- Definition

Amount of revenue from transactions with other operating segments of the same entity.

+ References

No definition available.

+ Details

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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

No definition available.

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X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

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X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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