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Equity Incentive Plans (Tables)
 9 Months Ended
Sep. 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 nine months ended September 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
601,802

 
$
42.58

 
 
 
 
Vested
(698,903
)
 
$
30.07

 
 
 
 
Forfeited / Canceled
(33,767
)
 
$
33.28

 
 
 
 
Unvested as of September 30, 2018
1,493,522

 
$
34.89

 
 
 
 
Expected to vest after September 30, 2018
1,344,519

 
$
34.88

 
2.6
 
$
42,581
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 nine months ended September 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
(441,495
)
 
$
8.54

 
 
 
$
12,678

Canceled
(509
)
 
$
32.31

 
 
 
 
Balance as of September 30, 2018
1,296,069

 
$
9.42

 
1.0
 
$
28,862

Exercisable as of September 30, 2018
1,296,069

 
$
9.42

 
1.0
 
$
28,862