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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2012
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
(8,655,000
)
 
 

Common stock available for grant of stock-based awards as of June 30, 2012
6,989,000
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 is as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Restricted stock
$
2,407

 
$
1,420

 
$
4,858

 
$
2,608

Stock options
1,536

 
1,620

 
3,092

 
2,957

Total
$
3,943

 
$
3,040

 
$
7,950

 
$
5,565
Schedule Of Cash Proceeds And Intrinsic Values For Stock Options Exercised
Cash proceeds and intrinsic values related to total stock options exercised during the three- and six-month periods ended June 30, 2012 and 2011 are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Proceeds from stock options exercised
$
1,478

 
$
3,254

 
$
4,950

 
$
3,485

Intrinsic value of stock options exercised
$
2,963

 
$
7,510

 
$
8,232

 
$
7,799
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:

 
 
2012
 
2011
Volatility
 
41.1% to 47.4%
 
47.6% to 48.7%
Risk free interest rate
 
0.48% to 0.87%
 
1.22% to 1.78%
Expected life in years
 
3.1 to 4.6
 
2.8 to 4.4
Dividend yield
 
0.00%
 
0.00%
Weighted average fair value
 
$14.03
 
$10.83
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, 2012 is as follows: 
 
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2012
 
2,703,000

 
$
17.79

 
 
 
 

Granted
 
190,000

 
40.71

 
 
 
 

Exercised
 
(316,000
)
 
15.69

 
 
 
 

Cancelled/Forfeited
 
(1,000
)
 
24.71

 
 
 
 

Outstanding at June 30, 2012
 
2,576,000

 
$
19.73

 
4.5 years
 
$
33,405

Exercisable at June 30, 2012
 
1,228,000

 
$
16.49

 
4.0 years
 
$
19,328
Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the six months ended June 30, 2012 and 2011:
 
 
 
2012
 
2011
 
 
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
 
671,000

 
$
25.44

 
563,000

 
$
17.20

Granted
 
1,140,000

 
41.13

 
323,000

 
31.16

Vested
 
(169,000
)
 
24.80

 
(179,000
)
 
14.93

Forfeited
 
—

 
—

 
—

 
—

Non-vested at June 30
 
1,642,000

 
$
36.40

 
707,000

 
$
24.15