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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Share Based Compensation Shares Authorized Under Stock Plans Issued And Avaliability
The following table summarizes the number of shares of common stock authorized for use under the Plan, the number of stock-based awards granted (net of expired or cancelled awards) under the Plan and the number of shares of common stock available for the grant of stock-based awards under the Plan: 

Common stock authorized
15,644,000

Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled
(12,013,000
)
 
 

Common stock available for grant of stock-based awards as of June 30, 2013
3,631,000
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total equity-based compensation for the three and six months ended June 30, 2013 and 2012 is as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Restricted stock
$
3,836

 
$
2,407

 
$
7,451

 
$
4,858

Stock options
1,335

 
1,536

 
2,871

 
3,092

Total
$
5,171

 
$
3,943

 
$
10,322

 
$
7,950
Schedule Of Cash Proceeds And Intrinsic Values For Stock Options Exercised

Note P – Stock-Based Compensation (continued)

Stock Options
 
Cash proceeds and intrinsic values related to total stock options exercised during the three and six months ended June 30, 2013 and 2012 are as follows:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Proceeds from stock options exercised
$
3,538

 
$
1,478

 
$
4,189

 
$
4,950

Intrinsic value of stock options exercised
$
8,711

 
$
2,963

 
$
9,439

 
$
8,232
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used
The following weighted average assumptions were used for stock options granted during the six months ended June 30, 2013 and 2012:

 
 
2013
 
2012
Volatility
 
36.9% to 44.8%
 
41.1% to 47.4%
Risk free interest rate
 
0.37% to 0.76%
 
0.48% to 0.87%
Expected life in years
 
4.1 to 5.1
 
3.1 to 4.6
Dividend yield
 
0.00%
 
0.00%
Weighted average fair value
 
$14.44
 
$14.03
Schedule of Share-based Compensation, Stock Options, Activity
Activity relating to stock options granted under the Company’s plans and outside the plans during the six months ended June 30, 2013 is as follows: 
 
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2013
 
2,269,000

 
$
20.57

 
 
 
 

Granted
 
346,500

 
44.02

 
 
 
 

Exercised
 
(284,000
)
 
14.73

 
 
 
 

Cancelled/Forfeited
 
(25,000
)
 
29.99

 
 
 
 

Outstanding at June 30, 2013
 
2,306,500

 
$
24.77

 
4.8 years
 
$
54,625

Exercisable at June 30, 2013
 
1,431,000

 
$
18.78

 
4.0 years
 
$
42,360
Schedule of Nonvested Share Activity


Restricted Stock
 
The following table summarizes restricted stock activity during the six months ended June 30, 2013 and 2012:

 
 
2013
 
2012
 
 
Number of Shares
 
Weighted Average Fair Value at Grant Date
 
Number of Shares
 
Weighted Average Fair Value at Grant Date
Non-vested at January 1
 
2,889,000

 
$
34.74

 
671,000

 
$
25.44

Granted
 
273,500

 
43.32

 
1,140,000

 
41.13

Vested
 
(211,000
)
 
37.10

 
(169,000
)
 
24.80

Forfeited
 
(16,000
)
 
30.81

 
—

 
—

Non-vested at June 30
 
2,935,500

 
$
36.77

 
1,642,000

 
$
36.40