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Industry Segments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Segment | Sep. 30, 2020 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Number of reportable operating segments | Segment |  |  |  | 2 |
Net sales | [1] | $ 370,310 | $ 343,609 | $ 988,939 | $ 845,850
Operating Income |  | 38,538 | 47,964 | 104,787 | 78,308
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] | 247,151 | 229,554 | 692,385 | 603,825
Operating Income |  | 27,854 | 36,409 | 89,352 | 74,564
Engine Management [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 7,278 | 4,725 | 17,822 | 11,405
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 119,075 | 110,393 | 288,019 | 234,227
Operating Income |  | 16,695 | 16,641 | 33,516 | 20,260
Temperature Control [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 2,254 | 1,784 | 7,226 | 4,562
All Other [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 4,084 | 3,662 | 8,535 | 7,798
Operating Income |  | (6,011) | (5,086) | (18,081) | (16,516)
All Other [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | $ (9,532) | $ (6,509) | $ (25,048) | $ (15,967)
[1] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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