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Acquired Intangible Assets, Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Indefinite Lived Intangible Assets [Abstract]    
Total acquired intangible assets $ 123,313 $ 123,631
Less accumulated amortization [1] (61,401) (59,431)
Net acquired intangible assets 61,912 64,200
Customer Relationships [Member]    
Indefinite Lived Intangible Assets [Abstract]    
Total acquired intangible assets 111,389 111,692
Trademarks and Trade Names [Member]    
Indefinite Lived Intangible Assets [Abstract]    
Total acquired intangible assets 6,980 6,980
Non-compete Agreements [Member]    
Indefinite Lived Intangible Assets [Abstract]    
Total acquired intangible assets 3,261 3,276
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.