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Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Indefinite Lived Intangible Assets [Abstract]      
Total acquired intangible assets $ 98,932   $ 98,871
Less accumulated amortization [1] (53,184)   (51,391)
Net acquired intangible assets 45,748   47,480
Amortization of acquired intangible assets [Abstract]      
Amortization expense 1,800 $ 1,900  
Estimated amortization expense, remainder of 2019 4,600    
Estimated amortization expense in year 2020 5,900    
Estimated amortization expense in year 2021 4,500    
Estimated amortization expense in year 2022 3,000    
Estimated amortization expense in years 2023 through 2031 22,500    
Customer Relationships [Member]      
Indefinite Lived Intangible Assets [Abstract]      
Total acquired intangible assets 87,256   87,195
Trademarks and Trade Names [Member]      
Indefinite Lived Intangible Assets [Abstract]      
Total acquired intangible assets 6,800   6,800
Intangible assets acquired [Abstract]      
Amount of acquired indefinite-lived intangible assets 5,200    
Non-compete Agreements [Member]      
Indefinite Lived Intangible Assets [Abstract]      
Total acquired intangible assets 3,193   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.