Description of Business and Summary of Significant Accounting Policies (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Customer Relationships [Member]	Dec. 31, 2011 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member] Minimum [Member]	Dec. 31, 2012 Customer Relationships [Member] Maximum [Member]	Dec. 31, 2012 Developed Technology [Member]	Dec. 31, 2011 Developed Technology [Member]	Dec. 31, 2012 Developed Technology [Member] Minimum [Member]	Dec. 31, 2012 Developed Technology [Member] Maximum [Member]	Dec. 31, 2012 Trademarks [Member]	Dec. 31, 2011 Trademarks [Member]	Dec. 31, 2012 Trademarks [Member] Minimum [Member]	Dec. 31, 2012 Trademarks [Member] Maximum [Member]	Dec. 31, 2012 Noncompete Agreements [Member]	Dec. 31, 2011 Noncompete Agreements [Member]	Dec. 31, 2012 Noncompete Agreements [Member] Maximum [Member]	Dec. 31, 2012 Backlog [Member]	Dec. 31, 2011 Backlog [Member]	Dec. 31, 2012 Database [Member]	Dec. 31, 2011 Database [Member]	Dec. 31, 2012 Database [Member] Maximum [Member]	Dec. 31, 2012 Customer/Territorial Relationships [Member]	Dec. 31, 2011 Customer/Territorial Relationships [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	$ 75,191	$ 54,882	$ 57,638	$ 40,289			$ 14,025	$ 11,640			$ 2,638	$ 2,188			$ 538	$ 418		$ 140	$ 140	$ 212	$ 207
Finite-lived intangible assets, accumulated amortization	(22,600)	(16,496)
Finite-lived intangible assets, net	52,591	38,386
Indefinite-lived intangible assets																							$ 30,887	$ 30,453
Finite-lived intangible asset, useful life					7 years	20 years			3 years	12 years			3 years	15 years			5 years					10 years