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Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets $ 57,021   $ 57,128
Less accumulated amortization [1] (30,222)   (29,040)
Net acquired intangible assets 26,799   28,088
Amortization of acquired intangible assets [Abstract]      
Amortization expense 1,200 $ 1,300  
Estimated amortization expense, remainder of 2016 3,600    
Estimated amortization expense in year 2017 4,700    
Estimated amortization expense in year 2018 4,500    
Estimated amortization expense in year 2019 3,800    
Estimated amortization expense in years 2020 through 2029 5,000    
Customer Relationships [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 48,368   48,475
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 970   970
Patents and Supply Contracts [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 723   723
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.