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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 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 June 30, 2012:
 
 
Outstanding Options (1)
 
Exercisable Options (1)
Range of Exercise Prices
Number
 
Weighted
Average Price
 
Number
 
Weighted
Average Price
$30.06-$31.48
334,036

 
$
30.09

 
138,229

 
$
30.13

$41.16-$43.94
259,632

 
42.72

 
241,000

 
42.63

$45.53-$73.32
381,893

 
49.05

 
308,784

 
49.29

Total options
975,561

 
$
40.87

 
688,013

 
$
43.11

 
(1)
The aggregate intrinsic value of outstanding and exercisable options at June 30, 2012 were $26.3 million and $17.0 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $67.67 per share on June 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 six months ended June 30, 2012:
 
 
Options
Outstanding
 
Weighted
Average
Exercise  /
Grant Price
 
Nonvested
Share
Awards
Outstanding
 
Weighted
Average
Exercise /
Grant Price
Total options and nonvested share awards outstanding at December 31, 2011
1,339,536

 
$
42.27

 
818,754

 
$
46.88

Granted
—

 
—

 
343,080

 
63.46

Exercised/vested
(332,032
)
 
44.61

 
(274,121
)
 
48.71

Forfeited
(31,943
)
 
60.56

 
(7,867
)
 
50.16

Net activity
(363,975
)
 
 
 
61,092

 
 
Total options and nonvested share awards outstanding at June 30, 2012
975,561

 
$
40.87

 
879,846

 
$
52.75