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Industry Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Segment | Jun. 30, 2017 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Number of reportable operating segments | Segment |  |  |  | 2 |
Net Sales | [1] | $ 286,636 | $ 312,729 | $ 548,462 | $ 595,107
Operating Income |  | 23,350 | 29,399 | 35,657 | 54,861
Intersegment Eliminations [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] | 203,429 | 223,349 | 402,917 | 434,663
Operating Income |  | 23,138 | 26,489 | 40,514 | 53,774
Engine Management [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net Sales | [1] | 4,981 | 5,831 | 10,972 | 13,143
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net Sales | [1] | 80,370 | 87,391 | 140,601 | 157,681
Operating Income |  | 4,882 | 8,262 | 5,713 | 12,229
Temperature Control [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net Sales | [1] | 2,140 | 2,095 | 3,820 | 4,124
All Other [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net Sales | [1] | 2,837 | 1,989 | 4,944 | 2,763
Operating Income |  | (4,670) | (5,352) | (10,570) | (11,142)
All Other [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Net Sales | [1] | $ (7,121) | $ (7,926) | $ (14,792) | $ (17,267)
[1] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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