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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
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
(19,999,000
)
Common stock available for grant of stock-based awards as of June 30, 2016
3,467,000
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, 2016 and 2015 is as follows:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Restricted stock
$
4,097

 
$
3,568

 
$
8,240

 
$
7,328

Stock options
612

 
756

 
1,396

 
1,754

Total
$
4,709

 
$
4,324

 
$
9,636

 
$
9,082
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 months ended June 30, 2016 and 2015 are as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Proceeds from stock options exercised
$
30

 
$
2,897

 
$
3,708

 
$
19,703

Intrinsic value of stock options exercised
$
20

 
$
1,848

 
$
11,050

 
$
29,294
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, 2016 and 2015:

 
 
2016
 
2015
Volatility
 
22.2% to 26.2%
 
22.4% to 28.3%
Risk free interest rate
 
1.07% to 1.73%
 
0.99% to 1.60%
Expected life in years
 
3.8 to 5.0
 
4.1 to 5.1
Dividend yield
 
0.00%
 
0.00%
Weighted average fair value
 
$7.38
 
$8.70
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, 2016 is as follows: 
 
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2016
 
2,016,000

 
$
23.51

 
 
 
 

Granted
 
72,500

 
32.44

 
 
 
 

Exercised
 
(410,500
)
 
9.04

 
 
 
 

Cancelled/Forfeited
 
(17,000
)
 
29.85

 
 
 
 

Outstanding at June 30, 2016
 
1,661,000

 
$
27.40

 
3.2 years
 
$
11,247

Exercisable at June 30, 2016
 
1,184,000

 
$
24.85

 
2.6 years
 
$
11,051
Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the six months ended June 30, 2016 and 2015:

 
 
2016
 
2015
 
 
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,
 
4,055,000

 
$
25.32

 
4,067,000

 
$
24.69

Granted
 
339,000

 
34.24

 
246,000

 
36.40

Vested
 
(187,000
)
 
30.30

 
(222,000
)
 
22.94

Forfeited
 
—

 
—

 
(68,000
)
 
34.27

Non-vested at June 30,
 
4,207,000

 
$
25.87

 
4,023,000

 
$
25.16