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Acquired Intangible Assets, Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | $ 184,362 | $ 123,636
Less accumulated amortization | [1] | (76,491) | (70,221)
Net acquired intangible assets |  | 107,871 | 53,415
Customer Relationships [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 157,119 | 111,701
Patents, Developed Technology and Intellectual Property [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 14,123 | 723
Trademarks and Trade Names [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 8,880 | 6,980
Acquired indefinite-lived intangible assets |  | 2,600 |
Non-compete Agreements [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 3,280 | 3,272
Supply Agreements [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 800 | 800
Leaseholds [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | $ 160 | $ 160
[1] | Applies to all intangible assets, except for trademarks and trade names totaling $2.6 million, which have indefinite useful lives and, as such, are not being amortized.

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