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Industry Segments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Segment
Jun. 30, 2019
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]        
Number of reportable operating segments | Segment     2  
Net sales [1] $ 247,939 $ 305,172 $ 502,241 $ 588,938
Operating Income (Loss) 16,021 27,728 30,344 45,685
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] 173,153 218,042 374,271 431,231
Operating Income (Loss) 16,722 25,709 38,155 48,053
Engine Management [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 2,666 4,921 6,680 10,270
Temperature Control [Member] | Reportable Segments [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 72,392 84,406 123,834 153,330
Operating Income (Loss) 3,967 7,154 3,619 9,204
Temperature Control [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 1,387 1,786 2,778 3,719
All Other [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 2,394 2,724 4,136 4,377
Operating Income (Loss) (4,668) (5,135) (11,430) (11,572)
All Other [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] $ (4,053) $ (6,707) $ (9,458) $ (13,989)
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.