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Acquired Intangible Assets, Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | $ 123,457 | $ 98,871
Less accumulated amortization | [1] | (57,329) | (51,391)
Net acquired intangible assets |  | 66,128 | 47,480
Customer Relationships [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 111,521 | 87,195
Trademarks [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 6,980 | 6,800
Non-compete Agreements [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 3,273 | 3,193
Patents [Member] |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |
Total acquired intangible assets |  | 723 | 723
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 $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

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