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Share Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following tables summarize compensation information regarding the restricted shares, LTIP Units, share options and Employee Share Purchase Plan (“ESPP”) for the three years ended December 31, 2013, 2012 and 2011 (amounts in thousands):

 
Year Ended December 31, 2013
 
Compensation
Expense
 
Compensation
Capitalized
 
Compensation
Equity
 
Dividends
Incurred
Restricted shares
$
12,185

 
$
1,079

 
$
13,264

 
$
967

LTIP Units
13,108

 
501

 
13,609

 
520

Share options
9,569

 
945

 
10,514

 
—

ESPP discount
612

 
20

 
632

 
—

Total
$
35,474

 
$
2,545

 
$
38,019

 
$
1,487


 
Year Ended December 31, 2012
 
Compensation
Expense
 
Compensation
Capitalized
 
Compensation
Equity
 
Dividends
Incurred
Restricted shares
$
8,014

 
$
922

 
$
8,936

 
$
949

LTIP Units
5,004

 
303

 
5,307

 
234

Share options
10,970

 
782

 
11,752

 
—

ESPP discount
844

 
121

 
965

 
—

Total
$
24,832

 
$
2,128

 
$
26,960

 
$
1,183


 
Year Ended December 31, 2011
 
Compensation
Expense
 
Compensation
Capitalized
 
Compensation
Equity
 
Dividends
Incurred
Restricted shares
$
8,041

 
$
1,061

 
$
9,102

 
$
1,121

LTIP Units
3,344

 
297

 
3,641

 
199

Share options
8,711

 
834

 
9,545

 
—

ESPP discount
1,081

 
113

 
1,194

 
—

Total
$
21,177

 
$
2,305

 
$
23,482

 
$
1,320
Award activity of the Share Incentive Plans
The table below summarizes the Award activity of the Share Incentive Plans for the three years ended December 31, 2013, 2012 and 2011:
 
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, 2010
10,106,488

 

$33.00

 
911,950

 

$32.05

 
247,508

 

$25.62

Awards granted (1)
1,491,311

 

$53.70

 
170,588

 

$53.99

 
223,452

 

$46.64

Awards exercised/vested (2) (3) (4)
(2,945,950
)
 

$32.27

 
(258,068
)
 

$38.32

 
(101,988
)
 

$38.57

Awards forfeited
(41,559
)
 

$35.14

 
(126,960
)
 

$37.19

 
(1,352
)
 

$27.79

Awards expired
(16,270
)
 

$44.13

 
—

 
—

 
—

 
—

Balance at December 31, 2011
8,594,020

 

$36.81

 
697,510

 

$34.17

 
367,620

 

$34.80

Awards granted (1)
1,164,484

 

$60.22

 
140,980

 

$60.20

 
70,235

 

$57.24

Awards exercised/vested (2) (3) (4)
(1,608,425
)
 

$30.87

 
(300,809
)
 

$23.79

 
(152,821
)
 

$21.11

Awards forfeited
(23,795
)
 

$51.55

 
(12,728
)
 

$46.25

 
—

 
—

Awards expired
(11,029
)
 

$35.53

 
—

 
—

 
—

 
—

Balance at December 31, 2012
8,115,255

 

$41.31

 
524,953

 

$46.81

 
285,034

 

$48.41

Awards granted (1)
1,006,444

 

$55.07

 
246,731

 

$55.37

 
281,931

 

$52.73

Awards exercised/vested (2) (3) (4)
(586,017
)
 

$29.34

 
(253,816
)
 

$36.81

 
(93,335
)
 

$32.97

Awards forfeited
(47,819
)
 

$56.16

 
(17,634
)
 

$55.74

 
(2,374
)
 

$56.72

Awards expired
(17,331
)
 

$47.51

 
—

 
—

 
—

 
—

Balance at December 31, 2013
8,470,532

 

$43.67

 
500,234

 

$55.79

 
471,256

 

$55.67


(1)
The weighted average grant date fair value for Options granted during the years ended December 31, 2013, 2012 and 2011 was $7.97 per share, $8.55 per share and $8.18 per share, respectively.
(2)
The aggregate intrinsic value of options exercised during the years ended December 31, 2013, 2012 and 2011 was $16.7 million, $46.7 million and $74.8 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, 2013, 2012 and 2011 was $13.9 million, $18.0 million  and $14.0 million, respectively.
(4)
The fair value of LTIP Units vested during the years ended December 31, 2013, 2012 and 2011 was $5.1 million, $9.1 million and $5.5 million, respectively.
Information regarding options outstanding and exercisable
The following table summarizes information regarding options outstanding and exercisable at December 31, 2013:

 
 
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
$18.70 to $24.93
 
1,235,980

 
5.08
 

$23.07

 
1,235,980

 

$23.07

$24.94 to $31.16
 
386,723

 
0.08
 

$29.25

 
386,723

 

$29.25

$31.17 to $37.39
 
1,332,280

 
4.58
 

$32.61

 
1,332,280

 

$32.61

$37.40 to $43.62
 
1,347,487

 
3.20
 

$40.46

 
1,347,487

 

$40.46

$43.63 to $49.86
 
61,187

 
6.55
 

$48.41

 
23,059

 

$48.06

$49.87 to $56.09
 
2,774,770

 
6.99
 

$53.91

 
1,226,038

 

$53.64

$56.10 to $62.32
 
1,332,105

 
8.20
 

$59.76

 
494,922

 

$59.98

$18.70 to $62.32
 
8,470,532

 
5.60
 

$43.67

 
6,046,489

 

$38.76

Vested and expected to vest
as of December 31, 2013
 
8,293,422

 
5.55
 

$43.42

 
 

 
 


(1)
The aggregate intrinsic value of options outstanding that are vested and expected to vest as of December 31, 2013 is $85.6 million.
(2)
The aggregate intrinsic value and weighted average remaining contractual life in years of options exercisable as of December 31, 2013 is $85.5 million and 4.5 years, respectively.