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Industry Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Segment | Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable operating segments | Segment |  |  |  | 2 |
Net sales | [1] | $ 312,729 | $ 288,977 | $ 595,107 | $ 527,888
Operating Income |  | 29,669 | 31,844 | 55,188 | 51,863
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 | [1] | 223,349 | 198,848 | 434,663 | 379,529
Operating Income |  | 26,489 | 30,548 | 53,774 | 54,752
Engine Management [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 5,831 | 5,817 | 13,143 | 10,689
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [1] | 87,391 | 87,503 | 157,681 | 144,269
Operating Income |  | 8,262 | 5,647 | 12,229 | 7,814
Temperature Control [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 2,095 | 2,121 | 4,124 | 3,715
All Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [1] | 1,989 | 2,626 | 2,763 | 4,090
Operating Income |  | (5,082) | (4,351) | (10,815) | (10,703)
All Other [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | $ (7,926) | $ (7,938) | $ (17,267) | $ (14,404)
[1] | Segment net sales includes intersegment sales in our Engine Management and Temperature Control segments.

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