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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.

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