Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
		Apr. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets			$ 123,631	$ 98,871
Less accumulated amortization	[1]		(59,431)	(51,391)
Net acquired intangible assets			64,200	47,480
Amortization of acquired intangible assets [Abstract]
Amortization expense			8,000	7,600	$ 8,000
Estimated amortization expense in year 2020			8,200
Estimated amortization expense in year 2021			6,800
Estimated amortization expense in year 2022			5,200
Estimated amortization expense in year 2023			5,000
Estimated amortization expense in years 2024 through 2034			33,800
Other Intangible Assets [Abstract]
Amortization expense			8,000	7,600	8,000
Pollak business of Stoneridge, Inc. [Member]
Other Intangible Assets [Abstract]
Intangible assets		$ 24,650
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets			$ 111,692	87,195
Customer Relationships [Member] | Pollak business of Stoneridge, Inc. [Member]
Other Intangible Assets [Abstract]
Intangible assets		$ 7,200
Estimated useful life of intangible assets		15 years	15 years
Customer Relationships [Member] | Pollak business of Stoneridge, Inc. [Member] | OE/OES [Member]
Other Intangible Assets [Abstract]
Intangible assets		$ 17,200
Estimated useful life of intangible assets		10 years	10 years
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets			$ 6,980	6,800
Intangible assets acquired [Abstract]
Amount of acquired indefinite-lived intangible assets			$ 5,200
Trademarks and Trade Names [Member] | Pollak business of Stoneridge, Inc. [Member]
Other Intangible Assets [Abstract]
Intangible assets		$ 200
Estimated useful life of intangible assets			10 years
Trademarks and Trade Names [Member] | Pollak business of Stoneridge, Inc. [Member] | OE/OES [Member]
Other Intangible Assets [Abstract]
Intangible assets		$ 200
Estimated useful life of intangible assets		10 years
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets			$ 3,276	3,193
Non-Compete Agreements [Member] | Pollak business of Stoneridge, Inc. [Member]
Other Intangible Assets [Abstract]
Intangible assets		$ 100
Estimated useful life of intangible assets		5 years	5 years
Patents [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets			$ 723	723
Supply Agreement [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets			800	800
Leaseholds [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets			160	160
Computer Software [Member]
Amortization of acquired intangible assets [Abstract]
Amortization expense			500
Other Intangible Assets [Abstract]
Other intangible assets			16,900	17,200
Accumulated computer software amortization			(16,200)	(16,300)
Amortization of computer software			400	$ 400	$ 500
Amortization expense			$ 500
Computer Software [Member] | Minimum [Member]
Other Intangible Assets [Abstract]
Estimated useful life of intangible assets			3 years
Computer Software [Member] | Maximum [Member]
Other Intangible Assets [Abstract]
Estimated useful life of intangible assets			10 years

[1] Applies to all intangible assets, except for related trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.