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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following weighted average assumptions were used for stock options granted:


Note I – Stock-Based Compensation (continued)

 
 
2014
 
2013
 
2012
Volatility
 
27% to 32%
 
31% to 45%
 
40% to 47%
Risk-free interest rate
 
1.06% to 1.80%
 
0.37% to 1.38%
 
0.47% to 0.87%
Expected life in years
 
3 to 5
 
4 to 5
 
3 to 5
Dividend yield
 
0.00%
 
0.00%
 
0.00%
Weighted average fair value
 
$9.90
 
$10.21
 
$9.43
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
23,466,000

Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled
(18,871,508
)
Common stock available for grant of stock-based awards as of December 31, 2014
4,594,492

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
 
 
Years Ended December 31,
 
2014
 
2013
 
2012
Restricted stock
$
15,007

 
$
15,097

 
$
11,622

Stock options
4,253

 
5,044

 
5,812

Total
$
19,260

 
$
20,141

 
$
17,434

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 three years ended December 31, 2014 is as follows: 
 
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2012
 
4,054,500

 
$
11.86

 
 
 
 
Granted
 
354,000

 
27.09

 
 
 
 
Exercised
 
(874,500
)
 
10.61

 
 
 
 
Cancelled/Forfeited
 
(130,500
)
 
13.40

 
 
 
 
Outstanding at December 31, 2012
 
3,403,500

 
13.71

 
 
 
 

Granted
 
584,000

 
30.03

 
 
 
 

Exercised
 
(563,000
)
 
10.28

 
 
 
 

Cancelled/Forfeited
 
(51,500
)
 
22.32

 
 
 
 

Outstanding at December 31, 2013
 
3,373,000

 
17.01

 

 


Granted
 
489,500

 
34.69

 
 
 
 
Exercised
 
(340,000
)
 
14.57

 
 
 
 
Cancelled/Forfeited
 
(94,500
)
 
28.77

 
 
 
 
Outstanding at December 31, 2014
 
3,428,000

 
$
19.48

 
3.0 years
 
$
43,999

Exercisable at December 31, 2014
 
2,353,000

 
$
14.51

 
2.1 years
 
$
40,811

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information about stock options at December 31, 2014:
 
Options Outstanding
 
Options Exercisable
Range of Exercise Price
Number Outstanding
 
Weighted Average Remaining Contractual Life (in Years)
 
Weighted Average Exercise Price
 
Number Exercisable
 
Weighted Average Exercise Price
$3.65 to $8.72
1,000,000

 
0.8
 
$5.61
 
1,000,000

 
$5.61
$9.50 to $14.99
95,000

 
2.2
 
13.87
 
76,000

 
13.70
$15.29 to $20.86
769,000

 
2.4
 
17.08
 
645,000

 
16.84
$21.17 to $26.95
431,000

 
3.7
 
24.54
 
415,000

 
24.59
$27.03 to $38.96
1,133,000

 
5.3
 
31.90
 
217,000

 
29.66
 
3,428,000

 
3.0
 
$19.48
 
2,353,000

 
$14.51
Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the three years ended December 31, 2014:

 
 
Number of Shares
 
Weighted Average Fair Value at Grant Date
Outstanding at January 1, 2012
 
1,006,500

 
$
16.96

Granted
 
3,670,500

 
24.23

Vested
 
(340,500
)
 
16.33

Forfeited
 
(3,000
)
 
25.40

Outstanding at December 31, 2012
 
4,333,500

 
23.16

Granted
 
434,000

 
29.21

Vested
 
(473,500
)
 
19.65

Forfeited
 
(37,000
)
 
18.82

Outstanding at December 31, 2013
 
4,257,000

 
24.24

Granted
 
182,000

 
34.88

Vested
 
(345,000
)
 
24.11

Forfeited
 
(27,000
)
 
29.34

Outstanding at December 31, 2014
 
4,067,000

 
$
24.69