Share Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2010

Share Incentive Plans (Tables) [Abstract]

Compensation information

	Year Ended December 31, 2010
	Compensation Expense		Compensation Capitalized		Compensation Equity		Dividends Incurred
Restricted shares	$	8,603	$	1,178	$	9,781	$	1,334
LTIP Units		2,334		190		2,524		138
Share options		6,707		714		7,421		—
ESPP discount		1,231		59		1,290		—
Total	$	18,875	$	2,141	$	21,016	$	1,472

	Year Ended December 31, 2009
	Compensation Expense		Compensation Capitalized		Compensation Equity		Dividends Incurred
Performance shares	$	103	$	76	$	179	$	—
Restricted shares		10,065		1,067		11,132		1,627
LTIP Units		1,036		158		1,194		254
Share options		5,458		538		5,996		—
ESPP discount		1,181		122		1,303		—
Total	$	17,843	$	1,961	$	19,804	$	1,881

	Year Ended December 31, 2008
	Compensation Expense			Compensation Capitalized		Compensation Equity			Dividends Incurred
Performance shares	$	(8	)	$	—	$	(8	)	$	—
Restricted shares		15,761			1,517		17,278			2,175
Share options		5,361			485		5,846			—
ESPP discount		1,197			92		1,289			—
Total	$	22,311		$	2,094	$	24,405		$	2,175

Award activity of the share incentive plans

	Common Shares Subject to Options			Weighted Average Exercise Price per Option		Restricted Shares			Weighted Average Fair Value per Restricted Share		LTIP Units			Weighted Average Fair Value per LTIP Unit
Balance at December 31, 2007		9,185,141		$	32.37		1,178,188		$	42.30
Awards granted (1)		1,436,574		$	38.46		524,983		$	38.29
Awards exercised/vested (2) (3)		(995,129	)	$	24.75		(644,131	)	$	35.99
Awards forfeited		(113,786	)	$	43.95		(63,029	)	$	44.87
Awards expired		(39,541	)	$	35.91		—			—
Balance at December 31, 2008		9,473,259		$	33.94		996,011		$	44.16		—			—
Awards granted (1)		2,541,005		$	23.08		362,997		$	22.62		155,189		$	21.11
Awards exercised/vested (2) (3)		(422,713	)	$	21.62		(340,362	)	$	42.67		—			—
Awards forfeited		(146,151	)	$	30.07		(64,280	)	$	35.28		(573	)	$	21.11
Awards expired		(95,650	)	$	32.21		—			—		—			—
Balance at December 31, 2009		11,349,750		$	32.03		954,366		$	37.10		154,616		$	21.11
Awards granted (1)		1,436,115		$	33.59		270,805		$	34.85		94,096		$	32.97
Awards exercised/vested (2) (3)		(2,506,645	)	$	28.68		(278,183	)	$	52.25		—			—
Awards forfeited		(76,275	)	$	29.43		(35,038	)	$	30.84		(1,204	)	$	21.11
Awards expired		(96,457	)	$	42.69		—			—		—			—
Balance at December 31, 2010		10,106,488		$	33.00		911,950		$	32.05		247,508		$	25.62

(1) The weighted average grant date fair value for Options granted during the years ended December 31, 2010, 2009 and 2008 was $6.18 per share, $3.38 per share and $4.08 per share, respectively.

(2) The aggregate intrinsic value of options exercised during the years ended December 31, 2010, 2009 and 2008 was $39.6 million, $2.8 million and $15.6 million, respectively. These values were calculated as the difference between the strike price of the underlying awards and the per share price at which each respective award was exercised.

(3) The fair value of restricted shares vested during the years ended December 31, 2010, 2009 and 2008 was $9.1 million, $8.0 million and $23.9 million, respectively.

Information regarding options outstanding and exercisable

	Options Outstanding (1)						Options Exercisable (2)
Range of Exercise Prices	Options		Weighted Average Remaining Contractual Life in Years		Weighted Average Exercise Price		Options		Weighted Average Exercise Price
$21.40 to $26.75		2,974,937		6.18	$	23.42		1,403,771	$	23.82
$26.76 to $32.10		2,478,594		3.09	$	29.99		2,478,594	$	29.99
$32.11 to $37.45		1,374,888		9.01	$	32.96		23,546	$	32.23
$37.46 to $42.80		2,363,450		5.87	$	40.44		2,023,316	$	40.75
$42.81 to $48.15		4,202		5.32	$	45.25		4,202	$	45.25
$48.16 to $53.50		910,417		6.09	$	53.19		853,222	$	53.50
$21.40 to $53.50		10,106,488		5.73	$	33.00		6,786,651	$	34.89
Vested and expected to vest as of December 31, 2010		9,718,763		5.69	$	33.12

(1) The aggregate intrinsic value of options outstanding that are vested and expected to vest as of December 31, 2010 is $184.3 million.

(2) The aggregate intrinsic value and weighted average remaining contractual life in years of options exercisable as of December 31, 2010 is $117.1 million and 4.4 years, respectively.