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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Option Activity
The following is a summary of the stock option activity under our share-based plans for the year ended December 31, 2012:

 
 
Shares
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining
Contractual Term
(Years)
 
Aggregate
Intrinsic Value
Balance at December 31, 2011
 
4,669,237

 
$
24.23

 
 
 
 
Granted
 
280,746

 
37.13

 
 
 
 

Less: Exercised
 
986,110

 
19.49

 
 
 
 

           Forfeited
 
19,682

 
24.26

 
 
 
 

Balance at December 31, 2012
 
3,944,191

 
$
26.33

 
5.16
 
$
63,069,781

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2012
 
2,090,468

 
$
28.89

 
3.46
 
$
28,091,967
Stock options outstanding and exercisable by exercise price range
The table below summarizes information about stock options outstanding and exercisable at December 31, 2012:

 
 
Outstanding
Stock Options
 
Exercisable
Stock Options
Range of exercise prices
 
Shares
 
Weighted Average
Remaining
Contractual Term
(Years)
 
Weighted Average Exercise Price
 
Shares
 
Weighted Average Exercise Price
$ 0.00 to $ 17.99
 
27,744

 
0.12
 
$
11.98

 
27,744

 
$
11.98

$ 18.00 to $ 23.99
 
2,062,660

 
5.25
 
20.11

 
885,433

 
20.42

$ 24.00 to $ 29.99
 
447,516

 
7.62
 
24.69

 
48,516

 
26.22

$ 30.00 to $ 47.30
 
1,406,271

 
4.36
 
36.27

 
1,128,775

 
36.06

 
 
3,944,191

 
5.16
 
$
26.33

 
2,090,468

 
$
28.89
Summary of cash proceeds and tax benefits realized from stock option exercise.
The following table summarizes the cash proceeds and tax benefits realized from the exercise of stock options:

 
 
Year Ended December 31,
(in thousands, except share amounts)
 
2012
 
2011
 
2010
Options exercised
 
986,110

 
958,509

 
650,210

Cash proceeds
 
$
19,221

 
$
12,173

 
$
5,411

Intrinsic value of options exercised
 
$
19,383

 
$
13,868

 
$
8,589

Tax benefits realized
 
$
7,418

 
$
5,409

 
$
3,375
Summary of assumptions for estimated fair value of employee stock option awards at grant date
We estimated the fair value of employee stock option awards at the grant date based on the assumptions summarized in the following table:
 
 
 
Year Ended December 31,
(Weighted average)
 
2012
 
2011
 
2010
Expected volatility
 
38.6
%
 
 
37.9
%
 
 
38.9
%
 
Expected term
 
7.6

years
 
7.8

years
 
6.7

years
Risk-free interest rate
 
1.61
%
 
 
3.10
%
 
 
3.23
%
 
Expected dividend yield
 
2.0
%
 
 
2.0
%
 
 
2.0
%
 
Grant date fair value
 
$
12.66

 
 
$
8.97

 
 
$
7.34

 
Summary of restricted share actvity
The following is a summary of the restricted stock awards activity under our share-based plans for the year ended December 31, 2012:

 
 
Shares
 
Weighted Average
Grant Date Fair Value
Balance unvested at December 31, 2011
 
505,290

 
$
22.37

Granted (at market price)
 
87,476

 
37.13

Less: Vested
 
69,580

 
33.60

Forfeited
 
7,000

 
22.53

Balance unvested at December 31, 2012
 
516,186

 
$
23.36
Total restricted stock awards that vested for the past three years and related fair value
The table below presents the total number of restricted stock awards that vested for the past three years and the related fair value of those awards (in thousands, except share amounts):

 
 
2012
 
2011
 
2010
Shares vested
 
69,580

 
32,856

 
44,152

Fair value of restricted stock awards vested
 
$
2,338

 
$
812

 
$
1,077
Number of shares purchased by employees under the employee stock purchase plan
For the two six month offering periods in each year presented below, our employees purchased the following aggregate number of shares:

2012
 
2011
 
2010
31,275

 
37,653

 
48,002
Restricted [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of share-based compensation expense and recognized tax benefits [Table Text Block]
The table below presents the total share-based compensation expense for restricted stock awards for the past three years (in thousands):

 
 
2012
 
2011
 
2010
Share-based compensation expense
 
$
3,873

 
$
3,507

 
$
3,028
Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of share-based compensation expense and recognized tax benefits [Table Text Block]
The table below presents the total share-based compensation expense for stock option awards and the related recognized tax benefits for the past three years (in thousands):

 
 
2012
 
2011
 
2010
Share-based compensation expense
 
$
4,304

 
$
4,497

 
$
4,570

Recognized tax benefits
 
1,647

 
1,721

 
1,796