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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)

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