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Industry Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable operating segments			2
Net sales	$ 264,162	$ 275,975	$ 764,996	$ 756,561
Intersegment revenue	0	0	0	0
Operating income	27,877	26,662	71,127	59,055
Engine Management [Member]
Segment Reporting Information [Line Items]
Net sales	177,939	175,789	535,498	511,448
Intersegment revenue	6,722	4,480	19,741	13,326
Operating income	26,518	20,664	72,006	51,982
Temperature Control [Member]
Segment Reporting Information [Line Items]
Net sales	84,840	95,229	224,228	233,556
Intersegment revenue	2,486	1,031	5,541	3,667
Operating income	7,501	9,057	13,787	16,880
All Other [Member]
Segment Reporting Information [Line Items]
Net sales	1,383	4,957	5,270	11,557
Intersegment revenue	(9,208)	(5,511)	(25,282)	(16,993)
Operating income	$ (6,142)	$ (3,059)	$ (14,666)	$ (9,807)

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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- 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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