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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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