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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, 2017
Mar. 31, 2016
Dec. 31, 2016
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Document Period End Date Mar. 31, 2017    
Finite-lived intangible assets, gross $ 91,409   $ 91,131
Finite-lived intangible assets, accumulated amortization (51,726)   (49,795)
Finite-lived intangible assets, net 39,683   41,336
Amortization of Acquired Intangible Assets 1,900 $ 1,700  
Customer Relationships [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross $ 71,556   71,338
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 $ 16,067   16,011
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 $ 2,670   2,666
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
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