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Equity Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block]
As of December 31, 2019, unrecognized compensation expense related to unvested RSUs and PSUs is expected to be recognized as follows (in thousands):
2020
$
16,776

2021
10,863

2022
6,054

2023
2,641

2024
182

Total unrecognized compensation expense
$
36,516
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the year ended December 31, 2019:
 
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, 2019
1,475,682

 
$
34.94

 
 
 
 
Granted (2)
1,021,535

 
$
27.82

 
 
 
 
Vested
(796,936
)
 
$
32.50

 
 
 
 
Forfeited / Canceled
(88,255
)
 
$
33.38

 
 
 
 
Unvested as of December 31, 2019
1,612,026

 
$
31.72

 
 
 
 
Expected to vest after December 31, 2019
1,458,089

 
$
31.75

 
2.5
 
$
52,054
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 year ended December 31, 2019:
 
Number
Outstanding
 
Weighted
Average Exercise Price
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Balance as of January 1, 2019
1,051,494

 
$
10.15

 
 
 
 
Exercised
(926,809
)
 
$
9.77

 
 
 
$
19,725

Canceled
(10,091
)
 
$
21.25

 
 
 
 
Balance as of December 31, 2019
114,594

 
$
12.26

 
0.1
 
$
2,686

Exercisable as of December 31, 2019
114,594

 
$
12.26

 
0.1
 
$
2,686