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Share-based compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
A summary of the stock option activity under our stock plan and related information for the years ended December 31, 2014, 2013, and 2012, follows:
 
 
Number of
Stock Options
 
Intrinsic Value of Options Exercised
Outstanding as of December 31, 2011
 
3,600

 
 
Granted
 
—

 
 
Exercised
 
(3,600
)
 
$
94,968

Forfeited
 
—

 
 
Outstanding as of December 31, 2012
 
—

 
 
Granted
 
—

 
 
Outstanding as of December 31, 2013
 
—

 


Granted
 
—

 
 
Outstanding as of December 31, 2014
 
—

 
 
Schedule of nonvested share award activity
A summary of the share awards activity under our stock plan and related information for the years ended December 31, 2014, 2013, and 2012, follows:
 
 
 
 
Number of Share Awards
 
Weighted Average
Grant Date
Fair Value Per Share
Outstanding as of December 31, 2011
 
 
 
550,763

 
$
71.04

 
Granted
 
 
 
310,240

 
$
72.85

 
Vested
 
 
 
(297,669
)
 
$
68.52

 
Forfeited
 
 
 
(2,266
)
 
$
74.30

 
Outstanding as of December 31, 2012
 
 
 
561,068

 
$
73.37

 
Granted
 
 
 
338,915

 
$
63.74

 
Vested
 
 
 
(323,594
)
 
$
71.78

 
Forfeited
 
 
 
(6,616
)
 
$
72.96

 
Outstanding as of December 31, 2013
 
 
 
569,773

 
$
68.54

 
Granted
 
 
 
416,954

 
$
72.25

 
Vested
 
 
 
(286,681
)
 
$
72.91

 
Forfeited
 
 
 
(25,077
)
 
$
55.72

 
Outstanding as of December 31, 2014
 
 
 
674,969

 
$
69.46

 
 
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
(In thousands)
 
2014
 
2013
 
2012
Total fair value of share awards vested
 
$
20,903

 
$
23,228

 
$
20,396
 
Total compensation recognized for awards, net of capitalization
 
$
13,996

 
$
15,552

 
$
14,160
 
Capitalized stock compensation
 
$
7,583

 
$
8,193

 
$
7,768