Income Taxes (Components Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Provision for accrued expenses	$ 63,704	$ 42,782
Net operating loss and tax credit carryforwards	28,430	28,986
Capitalized R&D expenditures	15	3,701
Stock-based compensation	45,149	47,139
Investment impairment		8,588
Other	23,531	13,187
Total deferred tax assets	160,829	144,383
Less valuation allowance	(23,422)	(37,958)
Net deferred tax assets	137,407	106,425
Prepaid merchant bookings and prepaid expenses	(59,333)	(44,213)
Intangible assets	(249,729)	(234,258)
Investment in subsidiaries	(9,603)	(8,988)
Unrealized gains	(13,106)	(8,823)
Property and equipment	(69,581)	(47,829)
Other	(534)	(3,816)
Total deferred tax liabilities	(401,886)	(347,927)
Net deferred tax liability	$ (264,479)	$ (241,502)