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Description of Business and Summary of Significant Accounting Policies (Finite-lived Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Document Period End Date Mar. 31, 2016    
Finite-lived intangible assets, gross $ 95,340   $ 95,220
Finite-lived intangible assets, accumulated amortization (45,199)   (43,372)
Finite-lived intangible assets, net 50,141   51,848
Amortization of Acquired Intangible Assets 1,700 $ 1,800  
Customer Relationships [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross $ 76,373   76,275
Customer Relationships [Member] | Minimum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 7 years    
Customer Relationships [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 20 years    
Developed technology [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross $ 15,129   15,121
Developed technology [Member] | Minimum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 3 years    
Developed technology [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 12 years    
Trademarks [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross $ 2,722   2,729
Trademarks [Member] | Minimum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 3 years    
Trademarks [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 15 years    
Backlog [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 1 year 2 months    
Non-compete agreements [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross $ 764   743
Non-compete agreements [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 5 years    
Backlog [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross $ 140   140
Database [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross $ 212   212
Database [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 10 years    
Customer Relationships [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Indefinite-lived intangible assets $ 30,887   $ 30,887