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Industry Segments (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Segment
Sep. 30, 2019
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]        
Number of reportable operating segments | Segment     2  
Net sales [1] $ 343,609 $ 307,723 $ 845,850 $ 896,661
Operating Income 47,964 31,304 78,308 76,989
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] 229,554 215,973 603,825 647,204
Operating Income 36,409 29,477 74,564 77,530
Engine Management [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 4,725 4,758 11,405 15,028
Temperature Control [Member] | Reportable Segments [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 110,393 88,301 234,227 241,631
Operating Income 16,641 7,478 20,260 16,682
Temperature Control [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 1,784 1,504 4,562 5,223
All Other [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 3,662 3,449 7,798 7,826
Operating Income (5,086) (5,651) (16,516) (17,223)
All Other [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] $ (6,509) $ (6,262) $ (15,967) $ (20,251)
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.