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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 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
23,466,000

Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled
(17,986,000
)
 
 

Common stock available for grant of stock-based awards as of December 31, 2013
5,480,000

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
 
 
Years Ended December 31,
 
2013
 
2012
 
2011
Restricted stock
$
15,097

 
$
11,622

 
$
5,787

Stock options
5,044

 
5,812

 
5,617

Total
$
20,141

 
$
17,434

 
$
11,404

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:  2013 2012 2011Volatility 31% to 45% 40% to 47% 43% to 49%Risk-free interest rate 0.37% to 1.38% 0.47% to 0.87% 0.61% to 1.78%Expected life in years 4 to 5 3 to 5 2 to 4Dividend yield 0.00% 0.00% 0.00%Weighted average fair value $10.21 $9.43 $7.31
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, 2013 is as follows: 
 
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2011
 
4,054,500

 
$
9.39

 
 
 
 
Granted
 
927,000

 
19.95

 
 
 
 
Exercised
 
(658,500
)
 
7.59

 
 
 
 
Cancelled/Forfeited
 
(268,500
)
 
12.95

 
 
 
 
Outstanding at December 31, 2011
 
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

 
3.6 years
 
$
94,064

Exercisable at December 31, 2013
 
2,163,000

 
12.88

 
2.8 years
 
$
51,269

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, 2013:

 
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
1,073,000

 
1.8
 
$5.67
 
1,073,000

 
$5.67
$9.50 to $14.99
203,000

 
3.2
 
13.43
 
80,500

 
13.26
$15.29 to $20.86
924,000

 
3.4
 
17.19
 
552,000

 
16.75
$21.17 to $26.95
448,000

 
4.8
 
24.55
 
407,500

 
24.62
$27.03 to $38.96
732,000

 
5.7
 
29.77
 
50,000

 
28.75
 
3,380,000

 
3.6
 
17.01
 
2,163,000

 
12.88
Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the three years ended December 31, 2013:

 
 
Number of Shares
 
Weighted Average Fair Value at Grant Date
Outstanding at January 1, 2011
 
843,000

 
$
11.47

Granted
 
574,500

 
21.10

Vested
 
(358,500
)
 
10.37

Forfeited
 
(52,500
)
 
18.96

Outstanding at December 31, 2011
 
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