Share-Based And Other Deferred Compensation (Summary Of Activity Related To Share-Based Payment Awards) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Acquisition-Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Balance at January 1, 2011, Number of Shares
Granted, Number of Shares	1,911
Modified, Number of Shares
Unvested Balance at January 1, 2011, Grant Date Weighted Average Fair Value
Granted, Grant Date Weighted Average Fair Value	43,537
Modified, Grant Date Weighted Average Fair Value
Forfeited, Grant Date Weighted Average Fair Value
Vested, Grant Date Weighted Average Fair Value
Unvested Balance at December 31, 2011, Grant Date Weighted Average Fair Value	43,537
IPO Event-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Shares
Modified, Number of Shares
Unvested Balance at December 31, 2011, Number of Shares	12
Unvested Balance at January 1, 2011, Grant Date Weighted Average Fair Value	13,034
Granted, Grant Date Weighted Average Fair Value
Modified, Grant Date Weighted Average Fair Value
Forfeited, Grant Date Weighted Average Fair Value	(567)
Vested, Grant Date Weighted Average Fair Value	(12,265)
Unvested Balance at December 31, 2011, Grant Date Weighted Average Fair Value	202
Equity Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Balance at January 1, 2011, Number of Shares	9,437
Granted, Number of Shares	2,209
Modified, Number of Shares	(97)
Forfeited, Number of Shares	(121)
Vested, Number of Shares	(3,077)
Unvested Balance at December 31, 2011, Number of Shares	8,351
Unvested Balance at January 1, 2011, Grant Date Weighted Average Fair Value	186,770
Granted, Grant Date Weighted Average Fair Value	70,225
Modified, Grant Date Weighted Average Fair Value	(527)
Forfeited, Grant Date Weighted Average Fair Value	(2,778)
Vested, Grant Date Weighted Average Fair Value	(65,639)
Unvested Balance at December 31, 2011, Grant Date Weighted Average Fair Value	$ 188,051