Investments in Affiliates, Net (Details) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended			1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Joint Venture Loan Originations Products and Services [Member]	Dec. 31, 2010 Joint Venture Loan Originations Products and Services [Member]	Dec. 31, 2009 Joint Venture Loan Originations Products and Services [Member]	Mar. 31, 2011 STARS [Member] Y	Dec. 31, 2011 STARS [Member]	Dec. 31, 2010 Dorado Network Systems [Member]	May 31, 2011 RP Data [Member]	Mar. 31, 2011 Acquisition Notes [Member] STARS [Member]	Dec. 31, 2011 Non Interest Bearing Acquisition Note [Member] Acquisition Notes [Member]	Dec. 31, 2010 Non Interest Bearing Acquisition Note [Member] Acquisition Notes [Member]
Schedule of Investments [Line Items]
Income Tax Of Equity In Earnings Of Affiliate	$ 19,200,000	$ 27,700,000	$ 32,400,000
Equity Method Investment, Dividends or Distributions	42,929,000	64,603,000	89,528,000
Equity Method Investment, Ownership Percentage				50.10%			50.10%		39.00%	40.20%
Joint Venture Investment Percentage Of Income In Equity Earnings Of Affiliates, Net Of Tax				88.10%	91.90%	87.60%
Equity Method Investment, Aggregate Cost							35,000,000
Payments to Acquire Interest in Joint Venture							20,000,000
Joint Venture Deferred Purchase Price											15,000,000
Joint Venture Deferred Payment Installment Amount								5,000,000
Long-term Debt	908,295,000	720,889,000										13,209,000	0
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity							30,800,000
Acquired Indefinite-lived Intangible Asset, Amount							9,700,000
Acquired Finite-lived Intangible Asset, Amount							21,100,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life							9.3
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized									(14,500,000)	58,900,000
Equity Method Investment, Other than Temporary Impairment	$ 30,700,000	$ 16,300,000	$ 5,400,000