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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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
 
Weighted Average Remaining Contractual Life (in years)
 
Aggregate Intrinsic Value
Balance at December 31, 2014
1,616

 
$19.34
 
 
 
 
Options granted
84

 
$36.60
 
 
 
 
Options exercised
(465
)
 
$19.35
 
 
 
 
Options canceled / forfeited / expired
(93
)
 
$19.04
 
 
 
 
Balance at December 31, 2015
1,142

 
$20.63
 
 
 
 
Options assumed
586

 
$29.05
 
 
 
 
Options exercised
(350
)
 
$20.01
 
 
 
 
Options canceled / forfeited / expired
(46
)
 
$23.25
 
 
 
 
Balance at December 31, 2016
1,332

 
$24.41
 
 
 
 
Options granted
70

 
$22.45
 
 
 
 
Options exercised
(180
)
 
$23.04
 
 
 
 
Options canceled / forfeited / expired
(50
)
 
$34.73
 
 
 
 
Balance at December 31, 2017
1,172

 
$24.06
 
3.52
 
$
4,538

 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2017
1,138

 
 
 
3.38
 
$
4,482

Exercisable at December 31, 2017
950

 
 
 
2.67
 
$
4,025
Summary of Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable under all of the Company’s plans at December 31, 2017: 
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise
Prices per Share
 
Number
Outstanding
(in thousands)
 
Weighted
Average
Remaining
Contractual
Life (in years)
 
Weighted
Average
Exercise Price
per Share
 
Number
Exercisable
(in thousands)
 
Weighted
Average
Exercise Price
per Share
$12.52 - $18.65
 
122

 
4.51
 
$
16.11

 
113

 
$
16.06

$18.74 - $18.76
 
14

 
4.08
 
$
18.75

 
14

 
$
18.75

$18.84 - $18.84
 
367

 
0.42
 
$
18.84

 
367

 
$
18.84

$18.89 - $19.73
 
149

 
5.41
 
$
19.40

 
107

 
$
19.40

$20.21 - $22.19
 
143

 
5.06
 
$
20.96

 
121

 
$
20.84

$22.24 - $26.16
 
119

 
7.89
 
$
23.25

 
21

 
$
25.52

$27.32 - $38.65
 
105

 
4.72
 
$
35.44

 
54

 
$
35.28

$40.87 - $40.87
 
4

 
0.13
 
$
40.87

 
4

 
$
40.87

$41.15 - $41.15
 
6

 
1.13
 
$
41.15

 
6

 
$
41.15

$43.77 - $43.77
 
143

 
2.78
 
$
43.77

 
143

 
$
43.77

$12.52 - $43.77
 
1,172

 
3.52
 
$
24.06

 
950

 
$
23.92
Summary of Restricted Stock Awards and Units
Information with respect to outstanding restricted stock awards and units as of December 31, 2017 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, 2014
502

 
633

 
1,135

 
$
20.30

Awards and units granted
472

 
90

 
562

 
$
39.77

Awards and units vested / earned
(240
)
 
(144
)
 
(384
)
 
$
20.17

Awards and units canceled / forfeited
(44
)
 
(60
)
 
(104
)
 
$
21.54

Balance at December 31, 2015
690

 
519

 
1,209

 
$
29.28

Awards and units granted
596

 
86

 
682

 
$
30.85

Awards assumed
925

 
—

 
925

 
$
40.13

Awards and units vested / earned
(398
)
 
(84
)
 
(482
)
 
$
32.18

Awards and units canceled / forfeited
(117
)
 
(137
)
 
(254
)
 
$
29.64

Balance at December 31, 2016
1,696

 
384

 
2,080

 
$
33.91

Awards and units granted
1,049

 
919

 
1,968

 
$
32.60

Awards and units vested / earned
(581
)
 
(94
)
 
(675
)
 
$
33.70

Awards and units canceled / forfeited
(150
)
 
(90
)
 
(240
)
 
$
31.07

Balance at December 31, 2017
2,014

 
1,119

 
3,133

 
$
33.35