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Industry Segments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Segment | Sep. 30, 2018 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Number of reportable operating segments | Segment |  |  |  | 2 |
Net sales | [1] | $ 307,723 | $ 296,619 | $ 896,661 | $ 845,081
Operating income |  | 31,304 | 27,178 | 76,989 | 62,835
Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 0 | 0 | 0 | 0
Engine Management [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 215,973 | 197,570 | 647,204 | 600,487
Operating income |  | 29,477 | 21,635 | 77,530 | 62,149
Engine Management [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 4,758 | 6,500 | 15,028 | 17,472
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 88,301 | 96,079 | 241,631 | 236,680
Operating income |  | 7,478 | 8,571 | 16,682 | 14,284
Temperature Control [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 1,504 | 2,444 | 5,223 | 6,264
All Other [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 3,449 | 2,970 | 7,826 | 7,914
Operating income |  | (5,651) | (3,028) | (17,223) | (13,598)
All Other [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | $ (6,262) | $ (8,944) | $ (20,251) | $ (23,736)
[1] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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