Share-Based And Other Deferred Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Acquisition-Related [Member]

Summary Of Activity Related To Share-Based Payment Awards

	Acquisition-related Awards
	Number of Shares		Grant Date Weighted Average Fair Value
Unvested Balance at January 1, 2011		—	$	—
Granted		1,911		43,537
Modified		—		—
Forfeited		—		—
Vested		—		—
Unvested Balance at December 31, 2011		1,911	$	43,537

IPO Event-Based Awards [Member]

Summary Of Activity Related To Share-Based Payment Awards

	Event-based Awards
	Number of Shares			Grant Date Weighted Average Fair Value
Unvested Balance at January 1, 2011		633		$	13,034
Granted		—			—
Modified		—			—
Forfeited		(27	)		(567	)
Vested		(594	)		(12,265	)
Unvested Balance at December 31, 2011		12		$	202

Equity Grants [Member]

Summary Of Activity Related To Share-Based Payment Awards

	Service-based Awards
	Number of Shares			Grant Date Weighted Average Fair Value
Unvested Balance at January 1, 2011		9,437		$	186,770
Granted		2,209			70,225
Modified		(97	)		(527	)
Forfeited		(121	)		(2,778	)
Vested		(3,077	)		(65,639	)
Unvested Balance at December 31, 2011		8,351		$	188,051