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Subsequent Event (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Apr. 30, 2019
Business Acquisition [Abstract]
Net sales	[1]	$ 283,766	$ 261,826
Pollak business of Stoneridge, Inc. [Member]
Business Acquisition [Abstract]
Net sales				$ 45,000
Subsequent Event [Member] | Pollak business of Stoneridge, Inc. [Member]
Business Acquisition [Abstract]
Acquisition of assets and liabilities					$ 40,000
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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