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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2012
Share-based Compensation [Abstract]  
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value
The following table summarizes outstanding share options and exercisable options at September 30, 2012:
 
 
Outstanding Options (1)
 
Exercisable Options (1)
Range of Exercise Prices
Number
 
Weighted
Average Price
 
Number
 
Weighted
Average Price
$30.06-$31.48
210,750

 
$
30.06

 
14,943

 
$
30.12

$41.16-$43.94
258,632

 
42.72

 
240,000

 
42.63

$45.53-$73.32
379,330

 
49.05

 
306,221

 
49.30

Total options
848,712

 
$
42.41

 
561,164

 
$
45.93

 
(1)
The aggregate intrinsic value of outstanding and exercisable options at September 30, 2012 were $18.9 million and $10.6 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $64.49 per share on September 30, 2012 and the strike price of the underlying award.
Summary Of Share Incentive Plans
The following table summarizes activity under our share incentive plans for the nine months ended September 30, 2012:
 
 
Options
Outstanding
 
Weighted
Average
Exercise
Price
 
Nonvested
Share
Awards
Outstanding
 
Weighted
Average
Grant  Price
Total options and nonvested share awards outstanding at December 31, 2011
1,339,536

 
$
42.27

 
818,754

 
$
46.88

Granted
—

 
—

 
345,180

 
63.50

Exercised/vested
(458,881
)
 
40.74

 
(274,119
)
 
48.71

Forfeited
(31,943
)
 
60.56

 
(13,338
)
 
51.52

Net activity
(490,824
)
 
 
 
57,723

 
 
Total options and nonvested share awards outstanding at September 30, 2012
848,712

 
$
42.41

 
876,477

 
$
52.77