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Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets $ 99,145   $ 98,966
Less accumulated amortization [1] (45,787)   (43,853)
Net acquired intangible assets 53,358   55,113
Amortization of acquired intangible assets [Abstract]      
Amortization expense 1,900 $ 2,100  
Estimated amortization expense, remainder of 2018 5,700    
Estimated amortization expense in year 2019 6,400    
Estimated amortization expense in year 2020 6,000    
Estimated amortization expense in year 2021 4,600    
Estimated amortization expense in years 2022 through 2031 25,500    
Customer Relationships [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 87,462   87,290
Trademarks and Trade Names [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
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]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 3,200   3,193
Patents [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 723   723
Supply Agreements [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 800   800
Leaseholds [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
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.