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Industry Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2019 USD ($) Segment	Mar. 31, 2018 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]
Number of reportable operating segments | Segment		2
Net sales	[1]	$ 283,766	$ 261,826
Operating income		17,957	12,307
Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	0	0
Engine Management [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	213,189	199,488
Operating income		22,344	17,376
Engine Management [Member] | Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	5,349	5,991
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	68,924	60,231
Operating income		2,050	831
Temperature Control [Member] | Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	1,933	1,680
All Other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	1,653	2,107
Operating income		(6,437)	(5,900)
All Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	$ (7,282)	$ (7,671)
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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