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Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Indefinite Lived Intangible Assets [Abstract]          
Total acquired intangible assets $ 98,970   $ 98,970   $ 98,966
Less accumulated amortization [1] (49,587)   (49,587)   (43,853)
Net acquired intangible assets 49,383   49,383   55,113
Amortization of acquired intangible assets [Abstract]          
Amortization expense 1,900 $ 1,900 5,700 $ 6,100  
Estimated amortization expense, remainder of 2018 1,800   1,800    
Estimated amortization expense in year 2019 6,300   6,300    
Estimated amortization expense in year 2020 5,900   5,900    
Estimated amortization expense in year 2021 4,600   4,600    
Estimated amortization expense in years 2022 through 2031 25,600   25,600    
Customer Relationships [Member]          
Indefinite Lived Intangible Assets [Abstract]          
Total acquired intangible assets 87,290   87,290   87,290
Trademarks and Trade Names [Member]          
Indefinite Lived Intangible Assets [Abstract]          
Total acquired intangible assets 6,800   6,800   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 3,197   3,197   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
[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.