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Industry Segments (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Segment
Sep. 30, 2020
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]        
Number of reportable operating segments | Segment     2  
Net sales [1] $ 370,310 $ 343,609 $ 988,939 $ 845,850
Operating Income 38,538 47,964 104,787 78,308
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] 247,151 229,554 692,385 603,825
Operating Income 27,854 36,409 89,352 74,564
Engine Management [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 7,278 4,725 17,822 11,405
Temperature Control [Member] | Reportable Segments [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 119,075 110,393 288,019 234,227
Operating Income 16,695 16,641 33,516 20,260
Temperature Control [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 2,254 1,784 7,226 4,562
All Other [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] 4,084 3,662 8,535 7,798
Operating Income (6,011) (5,086) (18,081) (16,516)
All Other [Member] | Intersegment Revenues [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Net sales [1] $ (9,532) $ (6,509) $ (25,048) $ (15,967)
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.