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Share Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2014
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, restricted units, share options and Employee Share Purchase Plan (“ESPP”) for the three years ended December 31, 2014, 2013 and 2012 (amounts in thousands):

 
Year Ended December 31, 2014
 
Compensation
Expense
 
Compensation
Capitalized
 
Compensation
Equity
 
Dividends
Incurred
Restricted shares
$
9,244

 
$
660

 
$
9,904

 
$
1,012

Restricted units
11,049

 
920

 
11,969

 
1,248

Share options
6,453

 
896

 
7,349

 
—

ESPP discount
797

 
62

 
859

 
—

Total
$
27,543

 
$
2,538

 
$
30,081

 
$
2,260


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

 
$
1,079

 
$
13,264

 
$
967

Restricted 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

Restricted 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
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, 2014, 2013 and 2012:
 
Common
Shares Subject
to Options
 
Weighted
Average
Exercise Price
per Option
 
Restricted
Shares
 
Weighted
Average Fair
Value per
Restricted Share
 
Restricted
Units
 
Weighted
Average Fair
Value per
Restricted Unit
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

Awards granted (1)
667,877

 

$56.72

 
176,457

 

$56.56

 
201,507

 

$53.82

Awards exercised/vested (2) (3) (4)
(2,086,380
)
 

$39.34

 
(175,344
)
 

$53.44

 
(60,294
)
 

$53.71

Awards forfeited
(19,022
)
 

$56.32

 
(6,735
)
 

$56.57

 
(667
)
 

$52.08

Awards expired
(2,387
)
 

$55.24

 
—

 
—

 
—

 
—

Conversion of restricted shares
to restricted units
—

 
—

 
(12,146
)
 
—

 
12,146

 
—

Balance at December 31, 2014
7,030,620

 

$46.16

 
482,466

 

$56.89

 
623,948

 

$53.38


(1)
The weighted average grant date fair value for Options granted during the years ended December 31, 2014, 2013 and 2012 was $9.21 per share, $7.97 per share and $8.55 per share, respectively.
(2)
The aggregate intrinsic value of options exercised during the years ended December 31, 2014, 2013 and 2012 was $50.8 million, $16.7 million and $46.7 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, 2014, 2013 and 2012 was $10.2 million, $13.9 million  and $18.0 million, respectively.
(4)
The fair value of restricted units vested during the years ended December 31, 2014, 2013 and 2012 was $3.2 million, $5.1 million and $9.1 million, respectively
Information regarding options outstanding and exercisable
    
The following table summarizes information regarding options outstanding and exercisable at December 31, 2014:
 
 
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
 
988,826

 
4.09
 

$23.07

 
988,826

 

$23.07

$31.17 to $37.39
 
1,091,358

 
3.61
 

$32.61

 
1,091,358

 

$32.61

$37.40 to $43.62
 
702,568

 
2.36
 

$40.12

 
702,568

 

$40.12

$43.63 to $49.86
 
24,628

 
5.83
 

$48.63

 
24,628

 

$48.63

$49.87 to $56.09
 
2,343,836

 
6.21
 

$53.93

 
1,387,110

 

$53.85

$56.10 to $62.32
 
1,879,404

 
7.87
 

$58.72

 
817,294

 

$59.84

$18.70 to $62.32
 
7,030,620

 
5.57
 

$46.16

 
5,011,784

 

$42.18

Vested and expected to vest
as of December 31, 2014
 
6,590,486

 
5.34
 

$45.50

 
 

 
 


(1)
The aggregate intrinsic value of options outstanding that are vested and expected to vest as of December 31, 2014 is $180.5 million.
(2)
The aggregate intrinsic value and weighted average remaining contractual life in years of options exercisable as of December 31, 2014 is $148.7 million and 4.6 years, respectively