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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2016
Schedule of stock-based compensation
The following table summarizes information about stock-based compensation:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Stock options
$
1,989

 
$
2,221

 
$
5,957

 
$
6,361

Restricted stock awards
6,786

 
5,776

 
18,794

 
14,398

ESPP Plan
206

 
150

 
656

 
475

Total stock-based compensation before taxes
$
8,981

 
$
8,147

 
$
25,407

 
$
21,234

Tax benefit
$
2,949

 
$
2,570

 
$
8,311

 
$
6,701
Stock options  
Schedule of fair value assumptions
The Company uses the Black-Scholes option pricing model for determining the estimated fair value for stock options. The weighted-average assumptions used in the Black-Scholes option pricing model are as follows: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Expected stock price volatility
46
%
 
46
%
 
45
%
 
48
%
Risk-free interest rate
1.27
%
 
1.27
%
 
1.16
%
 
1.26
%
Expected life of options (in years)
3.98

 
3.98

 
4.00

 
4.00

Expected dividend yield
0
%
 
0
%
 
0
%
 
0
%
Weighted-average fair value (grant date) of the options
$
15.53

 
$
15.53

 
$
11.08

 
$
16.54
Schedule of information about stock options outstanding
The following table summarizes information about stock options outstanding as of September 30, 2016: 
Options
 
Number of
Options
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2015
 
2,348

 
$
31.04

 
 
 
 
Options Granted
 
862

 
30.85

 
 
 
 
Options Exercised
 
(432
)
 
21.74

 
 
 
 
Options Cancelled
 
(169
)
 
36.38

 
 
 
 
Outstanding at September 30, 2016
 
2,609

 
$
32.17

 
4.76
 
$
24,664

Vested at September 30, 2016
 
2,445

 
$
32.08

 
4.68
 
$
23,261

Exercisable at September 30, 2016
 
1,129

 
$
29.97

 
3.08
 
$
13,049
Schedule of total intrinsic value for options exercised and fair value of vested options
The below table summarizes additional information related to stock options: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Total intrinsic value for stock options exercised
$
2,157

 
$
3,597

 
$
5,796

 
$
15,141

Fair value of vested options
3,571

 
2,064

 
27,241

 
18,741
Restricted stock awards  
Schedule of unvested restricted stock
A summary of the Company’s unvested restricted stock at September 30, 2016, and changes during the nine months ended September 30, 2016, is presented below: 
Non-Vested Restricted Stock
 
Number of
Awards
 
Weighted- Average
Grant Date
Fair Value
Non-vested at December 31, 2015
 
1,412

 
$
36.80

Granted
 
907

 
33.90

Vested
 
(569
)
 
35.68

Forfeited
 
(134
)
 
38.85

Non-vested at September 30, 2016
 
1,616

 
$
35.40