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Acquired Intangible Assets (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets $ 52,812,000   $ 52,772,000
Less accumulated amortization (20,353,000) [1]   (19,202,000) [1]
Net acquired intangible assets 32,459,000   33,570,000
Amortization of acquired intangible assets [Abstract]      
Amortization expense 1,100,000 1,300,000  
Estimated amortization expense, remainder of current year 3,400,000    
Estimated amortization expense in year 2015 4,300,000    
Estimated amortization expense in year 2016 4,200,000    
Estimated amortization expense in years 2016 through 2028 15,400,000    
Customer Relationships [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 44,219,000   44,179,000
Trademarks and Trade Names [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 6,800,000   6,800,000
Intangible assets acquired [Abstract]      
Amount of acquired indefinite-lived intangible assets 5,200,000    
Non-compete Agreements [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 910,000   910,000
Patents and Supply Contracts [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 723,000   723,000
Leaseholds [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets $ 160,000   $ 160,000
[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.