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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
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 December 31, 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
255,632

 
42.72

 
237,000

 
42.62

$45.53-$73.32
372,372

 
49.07

 
299,263

 
49.33

Total options
838,754

 
$
42.36

 
551,206

 
$
45.92


(1)
The aggregate intrinsic value of outstanding and exercisable options at December 31, 2012 was approximately $21.8 million and $12.4 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $68.21 per share on December 31, 2012 and the strike price of the underlying award.
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]  
The following assumptions were used for options granted in 2010:
 
 
Year Ended
December 31,
 
2010
Weighted average fair value of options granted
$11.69
Expected volatility
35.6% - 39.2%
Risk-free interest rate
3.6% - 3.7%
Expected dividend yield
4.1% - 4.4%
Expected life (in years)
7 - 9
Summary Of Share Incentive Plans
The following table summarizes activity under our share incentive plans for the three years ended December 31:
 
 
Options
Outstanding
 
Weighted
Average
Exercise  /
Grant Price
 
Nonvested
Share
Awards
Outstanding
 
Weighted
Average
Exercise  /
Grant Price
Options and nonvested share awards outstanding at December 31, 2009
1,983,358

 
$
41.39

 
595,153

 
$
46.20

2010 Activity:
 
 
 
 
 
 
 
Granted
55,895

 
43.94

 
372,661

 
40.05

Exercised/Vested
(141,213
)
 
32.54

 
(214,923
)
 
49.17

Forfeited
(50,904
)
 
46.65

 
(11,386
)
 
39.64

Net activity
(136,222
)
 
 
 
146,352

 
 
Balance at December 31, 2010
1,847,136

 
$
42.37

 
741,505

 
$
42.16

2011 Activity:
 
 
 
 
 
 
 
Granted
—

 
—

 
347,084

 
57.00

Exercised/Vested
(504,838
)
 
42.59

 
(243,874
)
 
47.19

Forfeited
(2,762
)
 
48.02

 
(25,961
)
 
44.51

Net activity
(507,600
)
 
 
 
77,249

 
 
Balance at December 31, 2011
1,339,536

 
$
42.27

 
818,754

 
$
46.88

2012 Activity:
 
 
 
 
 
 
 
Granted
—

 
—

 
346,330

 
63.51

Exercised/Vested
(468,839
)
 
40.86

 
(282,552
)
 
49.28

Forfeited
(31,943
)
 
60.56

 
(20,279
)
 
52.05

Net activity
(500,782
)
 
 
 
43,499

 
 
Total options and nonvested share awards outstanding at December 31, 2012
838,754

 
$
42.36

 
862,253

 
$
52.64

  
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]
The following table presents information related to our ESPP:

 
2012
 
2011
 
2010
Shares purchased
20,137

 
19,914

 
29,100

Weighted average fair value of shares purchased
$
67.80

 
$
63.29

 
$
50.70

Expense recorded (in millions)
$
0.3

 
$
0.3

 
$
0.5