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Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets $ 99,059   $ 99,059   $ 98,742
Less accumulated amortization [1] (41,945)   (41,945)   (35,830)
Net acquired intangible assets 57,114   57,114   62,912
Amortization of acquired intangible assets [Abstract]          
Amortization expense 1,900 $ 2,200 6,100 $ 4,900  
Estimated amortization expense, remainder of 2017 1,900   1,900    
Estimated amortization expense in year 2018 7,600   7,600    
Estimated amortization expense in year 2019 6,300   6,300    
Estimated amortization expense in year 2020 5,900   5,900    
Estimated amortization expense in years 2021 through 2031 30,200   30,200    
Customer Relationships [Member]          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 87,376   87,376   87,070
Trademarks and Trade Names [Member]          
Acquired Indefinite-lived Intangible Assets [Line Items]          
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]          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 3,200   3,200   3,189
Patents [Member]          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 723   723   723
Supply Agreements [Member]          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 800   800   800
Leaseholds [Member]          
Acquired Indefinite-lived Intangible Assets [Line Items]          
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.