Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 16, 2013 Rate	Nov. 28, 2011	Nov. 22, 2011	Aug. 31, 2007 Rate	Aug. 15, 2007 Rate
Commitments And Contingencies [Line Items]
Rental expenses under operating leases	$ 1,900,000	$ 3,000,000	$ 10,600,000
Number of domain names registered	112,000,000
Uncertain tax positions	187,200,000
Line of Credit Facility, Current Borrowing Capacity						200,000,000
Borrowing capacity of senior unsecured revolving credit facility	200,000,000
Line of Credit Facility, Amount Borrowed					100,000,000
Principal amount of convertible debentures	1,250,000,000	1,250,000,000		750,000,000				1,250,000,000
Convertible debenture, interest rate				4.625%			3.25%	3.25%
Limit of Tax Deductible Compensation	1,000,000
Indemnification period (months)	60
Claims threshold amount to trigger indemnification obligation	4,000,000
Percentage of claims to be indemnified	50.00%
Maximum indemnification obligation	50,000,000
ICANN Agreement [Member]
Commitments And Contingencies [Line Items]
Expiration Date of Registry Agreement	November 30, 2018
Registry fee per transaction	0.25
Payments for registry fees	27,900,000	18,700,000	18,000,000
.TV Agreement [Member]
Commitments And Contingencies [Line Items]
renewed agreement fees	$ 4,500,000	$ 4,000,000	$ 2,500,000