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Industry Segments (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) Segment | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable operating segments | Segment |  | 2 |
Net sales | [1] | $ 261,826 | $ 282,378
Operating Income |  | 12,307 | 25,462
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | [1] | 0 | 0
Engine Management [Member] | Reportable Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | [1] | 199,488 | 211,314
Operating Income |  | 17,376 | 27,285
Engine Management [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | [1] | 5,991 | 7,312
Temperature Control [Member] | Reportable Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | [1] | 60,231 | 70,290
Operating Income |  | 831 | 3,967
Temperature Control [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | [1] | 1,680 | 2,029
All Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | [1] | 2,107 | 774
Operating Income |  | (5,900) | (5,790)
All Other [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | [1] | $ (7,671) | $ (9,341)
[1] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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