Acquisitions (Details) (USD $)				1 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Fiserv [Member]	Feb. 28, 2013 RESDirect [Member]	Jun. 30, 2013 Trade Names [Member] Fiserv [Member]	Jun. 30, 2013 Customer Lists [Member] Fiserv [Member]	Jun. 30, 2013 Customer Lists [Member] RESDirect [Member]
Business Acquisition [Line Items]
Cost of acquired entity			$ 6,000,000
Business acquisition, cash paid to acquire entity				4,000,000
Acquired finite-lived ntangible asset, weighted average useful life					10 years	10 years	3 years
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets					3,000,000	1,800,000	1,500,000
Purchase price allocation, goodwill	$ 1,486,207,000	$ 1,504,232,000	$ 600,000