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Description of Business and Summary of Significant Accounting Policies (Finite-lived Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]          
Document Period End Date     Sep. 30, 2016    
Finite-lived intangible assets, gross $ 86,490   $ 86,490   $ 95,220
Finite-lived intangible assets, accumulated amortization (48,339)   (48,339)   (43,372)
Finite-lived intangible assets, net 38,151   38,151   51,848
Amortization of Acquired Intangible Assets 1,700 $ 1,800 5,100 $ 5,400  
Customer Relationships [Member]          
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]          
Finite-lived intangible assets, gross 67,679   $ 67,679   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 15,012   $ 15,012   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 2,683   $ 2,683   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   $ 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   140
Database [Member]          
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]          
Finite-lived intangible assets, gross 212   $ 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   $ 30,887