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Stock Options, Restricted Stock and Employee Stock Purchase Plan (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The assumptions used in estimating the fair value of the stock options granted during the period, along with the weighted-average grant date fair values, were as follows:

 
2017
 
2016
 
2015
Expected volatility
50%
—
50%
 
46%
—
50%
 
42%
—
47%
Expected life (in years)
 
4.8
 
 
 
4.7
  
 
 
4.8
 
Risk-free interest rate
1.7%
—
1.7%
 
0.9%
—
1.8%
 
1.5%
—
1.6%
Dividend yield
 
—
 
 
 
—
 
 
 
—
 
Weighted-average grant date fair value per stock option
 
$9.25
 
 
 
$11.13
 
 
 
$14.59
 
Schedule of Share-based Compensation, Activity
A summary of stock option activity within the Company’s stock-based compensation plans for the years ended December 31, 2017, 2016 and 2015 is as follows:

 
 
 
 
 
 
Number of
Shares
(in thousands)
 
 
Weighted
Average
Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate
Intrinsic Value
(in thousands) (1)
Outstanding at December 31, 2014
 
6,386

 
$
11.44

 
 
 
 

Granted
 
1,016

 
37.60

 
 
 
 

Exercised
 
(2,519
)
 
4.09

 
 
 
 

Forfeited or expired
 
(121
)
 
34.78

 
 
 
 

Outstanding at December 31, 2015
 
4,762

 
$
20.33

 
 
 
 

Granted
 
2,089

 
26.61

 
 
 
 

Exercised
 
(1,794
)
 
7.78

 
 
 
 

Forfeited or expired
 
(291
)
 
28.96

 
 
 
 

Outstanding at December 31, 2016
 
4,766

 
$
27.27

 
 
 
 

Granted
 
66

 
21.28

 
 
 
 

Exercised
 
(623
)
 
15.53

 
 
 
 

Forfeited or expired
 
(156
)
 
28.20

 
 
 
 

Outstanding at December 31, 2017
 
4,053

 
$
28.95

 
4.56
 
$
21,459

Exercisable at December 31, 2017
 
1,845

 
$
29.15

 
3.94
 
$
10,103



(1)
Includes only those options that were in-the-money as of December 31, 2017. Fluctuations in the intrinsic value of both outstanding and exercisable options may result from changes in underlying stock price and the timing and volume of option grants, exercises and forfeitures.
Schedule of Nonvested Restricted Stock Units Activity
The following is a summary of non-vested restricted stock activity:
 
Number of Shares
(in thousands)
 
Weighted Average Per Share
Grant Date Fair Value
Nonvested at December 31, 2014
337

 
$
35.31

Granted
—

 
—

Vested
(84
)
 
35.31

Canceled
—

 
—

Nonvested at December 31, 2015
253

 
$
35.31

Granted
303

 
29.50

Vested
(118
)
 
34.95

Canceled
(22
)
 
28.85

Nonvested at December 31, 2016
416

 
$
31.52

Granted
666

 
33.10

Vested
(137
)
 
32.55

Canceled
(57
)
 
31.34

Nonvested at December 31, 2017
888

 
$
32.55