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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
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
(21,528,000
)
Common stock available for grant of stock-based awards as of March 31, 2017
1,938,000
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total equity-based compensation for the three months ended March 31, 2017 and 2016 is as follows:

 
Three Months Ended March 31,
 
2017
 
2016
Restricted stock
$
4,214

 
$
4,143

Stock options
962

 
784

Total
$
5,176

 
$
4,927
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 months ended March 31, 2017 and 2016 are as follows:

 
Three Months Ended March 31,
 
2017
 
2016
Proceeds from stock options exercised
$
1,812

 
$
3,678

Intrinsic value of stock options exercised
$
1,011

 
$
11,030
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 three months ended March 31, 2017 and 2016:

 
 
2017
 
2016
Volatility
 
23.2% to 26.4%
 
22.2% to 26.2%
Risk free interest rate
 
1.48% to 1.99%
 
1.20% to 1.73%
Expected life in years
 
3.4 to 5.0
 
3.8 to 5.0
Dividend yield
 
0.00%
 
0.00%
Weighted average fair value
 
$8.97
 
$7.26
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 months ended March 31, 2017 is as follows: 
 
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2017
 
1,499,000

 
$
29.72

 
 
 
 

Granted
 
899,000

 
37.06

 
 
 
 

Exercised
 
(74,000
)
 
24.29

 
 
 
 

Forfeited
 
(1,000
)
 
36.59

 
 
 
 

Outstanding at March 31, 2017
 
2,323,000

 
$
32.73

 
4.6 years
 
$
13,513

Exercisable at March 31, 2017
 
1,058,000

 
$
28.44

 
2.6 years
 
$
10,702
Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the three months ended March 31, 2017 and 2016:

 
 
2017
 
2016
 
 
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,
 
4,191,000

 
$
25.93

 
4,055,000

 
$
25.32

Granted
 
166,000

 
36.61

 
273,000

 
34.06

Vested
 
(125,000
)
 
33.15

 
(126,000
)
 
29.51

Forfeited
 
(3,000
)
 
34.77

 
—

 
—

Non-vested at March 31,
 
4,229,000

 
$
26.13

 
4,202,000

 
$
25.81