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Industry Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Segment | Jun. 30, 2021 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Number of reportable operating segments | Segment |  |  |  | 2 |
Net sales | [1] | $ 359,412 | $ 342,076 | $ 682,243 | $ 618,629
Operating Income (Loss) |  | 27,893 | 36,925 | 54,808 | 66,249
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] | 241,873 | 233,216 | 481,130 | 445,234
Operating Income (Loss) |  | 21,100 | 30,384 | 47,816 | 61,498
Engine Management [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 5,007 | 5,185 | 10,796 | 10,544
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 114,432 | 106,471 | 195,753 | 168,944
Operating Income (Loss) |  | 12,265 | 13,229 | 17,483 | 16,821
Temperature Control [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 2,831 | 3,125 | 6,047 | 4,972
All Other [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | 3,107 | 2,389 | 5,360 | 4,451
Operating Income (Loss) |  | (5,472) | (6,688) | (10,491) | (12,070)
All Other [Member] | Intersegment Revenues [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net sales | [1] | $ (7,838) | $ (8,310) | $ (16,843) | $ (15,516)
[1] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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