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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
A summary of the stock option activity is presented below (in thousands, except per share amounts):
 
Options Outstanding
 
Number of
Shares Subject to Options
 
Weighted
Average
Exercise
Price Per
Share
Balance at December 31, 2017
1,172

 
$24.06
Options granted
—

 
—
Options exercised
(426
)
 
$18.76
Options canceled / forfeited / expired
(59
)
 
$35.21
Balance at June 30, 2018
687

 
$26.39
 
 
 
 
Summary of Restricted Stock Awards and Units
Information with respect to outstanding restricted stock awards and units as of June 30, 2018 is as follows (in thousands, except per share amounts):
 
Restricted Stock and Restricted Stock Units
 
Number of Shares
Subject to Time-
based Vesting
 
Number of Shares
Subject to
Performance-
based Vesting
 
Total Number
of Shares
 
Weighted Average
Grant Date Fair
Value Per Share
Balance at December 31, 2017
2,014

 
1,119

 
3,133

 
$
33.35

Awards and units granted
1,013

 
45

 
1,058

 
$
22.29

Awards and units vested / earned
(604
)
 
(176
)
 
(780
)
 
$
35.00

Awards and units canceled / forfeited
(128
)
 
(228
)
 
(356
)
 
$
29.48

Balance at June 30, 2018
2,295

 
760

 
3,055

 
$
29.55