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Acquired Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 30, 2019 | Dec. 31, 2018
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |  |
Total acquired intangible assets |  | $ 123,542 |  | $ 123,542 |  |  | $ 98,871
Less accumulated amortization | [1] | (55,313) |  | (55,313) |  |  | (51,391)
Net acquired intangible assets |  | 68,229 |  | 68,229 |  |  | 47,480
Amortization of acquired intangible assets [Abstract] |  |  |  |  |  |  |
Amortization expense |  | 2,100 | $ 1,900 | 3,900 | $ 3,800 |  |
Estimated amortization expense, remainder of 2019 |  | 4,100 |  | 4,100 |  |  |
Estimated amortization expense in year 2020 |  | 8,200 |  | 8,200 |  |  |
Estimated amortization expense in year 2021 |  | 6,800 |  | 6,800 |  |  |
Estimated amortization expense in year 2022 |  | 5,200 |  | 5,200 |  |  |
Estimated amortization expense in years 2023 through 2034 |  | 38,700 |  | 38,700 |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |  |
Total acquired intangible assets |  | 111,604 |  | 111,604 |  |  | 87,195
Trademarks [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |  |
Total acquired intangible assets |  | 6,980 |  | 6,980 |  |  | 6,800
Intangible assets acquired [Abstract] |  |  |  |  |  |  |
Amount of acquired indefinite-lived intangible assets |  | 5,200 |  | 5,200 |  |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |  |
Total acquired intangible assets |  | 3,275 |  | 3,275 |  |  | 3,193
Patents [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |  |
Total acquired intangible assets |  | 723 |  | 723 |  |  | 723
Supply Agreements [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |  |
Total acquired intangible assets |  | 800 |  | 800 |  |  | 800
Leaseholds [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |  |
Total acquired intangible assets |  | $ 160 |  | $ 160 |  |  | $ 160
Pollak business of Stoneridge, Inc. [Member] |  |  |  |  |  |  |
Other Intangible Assets [Abstract] |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 24,650 |
Estimated useful life of intangible assets |  |  |  | 15 years |  |  |
Pollak business of Stoneridge, Inc. [Member] | OE/OES [Member] |  |  |  |  |  |  |
Other Intangible Assets [Abstract] |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  | 10 years |  |  |
Pollak business of Stoneridge, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Other Intangible Assets [Abstract] |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 7,200 |
Estimated useful life of intangible assets |  |  |  | 15 years |  |  |
Pollak business of Stoneridge, Inc. [Member] | Customer Relationships [Member] | OE/OES [Member] |  |  |  |  |  |  |
Other Intangible Assets [Abstract] |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 17,200 |
Estimated useful life of intangible assets |  |  |  | 10 years |  |  |
Pollak business of Stoneridge, Inc. [Member] | Trademarks [Member] |  |  |  |  |  |  |
Other Intangible Assets [Abstract] |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 200 |
Estimated useful life of intangible assets |  |  |  | 10 years |  |  |
Pollak business of Stoneridge, Inc. [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |
Other Intangible Assets [Abstract] |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 100 |
Estimated useful life of intangible assets |  |  |  | 5 years |  |  |
[1] | Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

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