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Equity Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the six months ended June 30, 2018:
 
Number
Outstanding
 
Weighted
Average
Grant Date
Fair Value
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Unvested as of January 1, 2018
1,624,390

 
$
29.94

 
 
 
 
Granted
593,131

 
$
42.72

 
 
 
 
Vested
(414,625
)
 
$
28.95

 
 
 
 
Forfeited / Canceled
(25,961
)
 
$
32.62

 
 
 
 
Unvested as of June 30, 2018
1,776,935

 
$
34.40

 
 
 
 
Expected to vest after June 30, 2018
1,618,650

 
$
34.34

 
2.8
 
$
51,633
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes activity related to our stock options under the Equity Incentive Plan for the six months ended June 30, 2018:
 
Number
Outstanding
 
Weighted
Average Exercise Price
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Balance as of January 1, 2018
1,738,073

 
$
9.20

 
 
 
 
Exercised
(321,267
)
 
$
9.10

 
 
 
$
9,450

Canceled
(509
)
 
$
32.31

 
 
 
 
Balance as of June 30, 2018
1,416,297

 
$
9.22

 
1.2
 
$
32,126

Exercisable as of June 30, 2018
1,416,297

 
$
9.22

 
1.2
 
$
32,126