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Industry Segments (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]
Number of reportable operating segments | Segment				2
Net Sales	[1]	$ 286,636	$ 312,729	$ 548,462	$ 595,107
Operating Income		23,350	29,399	35,657	54,861
Intersegment Eliminations [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]	203,429	223,349	402,917	434,663
Operating Income		23,138	26,489	40,514	53,774
Engine Management [Member] | Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net Sales	[1]	4,981	5,831	10,972	13,143
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net Sales	[1]	80,370	87,391	140,601	157,681
Operating Income		4,882	8,262	5,713	12,229
Temperature Control [Member] | Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net Sales	[1]	2,140	2,095	3,820	4,124
All Other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net Sales	[1]	2,837	1,989	4,944	2,763
Operating Income		(4,670)	(5,352)	(10,570)	(11,142)
All Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net Sales	[1]	$ (7,121)	$ (7,926)	$ (14,792)	$ (17,267)
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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