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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity
A summary of the transactions within the Company’s stock option plans follows (shares in thousands):  
 
Shares
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2018
463

 
27.47

Granted
—

 
—

Exercised
(425
)
 
25.51

Canceled
(1
)
 
22.25

Outstanding at December 31, 2019
37

 
50.40

Exercisable at December 31, 2019
31

 
$
44.85


The following table presents information associated with stock options as of December 31, 2019 and 2018, and for the years ended December 31, 2019, 2018 and 2017:
 
2019
 
2018
 
2017
Intrinsic value of options outstanding as of December 31
$
4

 
$
35

 

Intrinsic value of options exercisable as of December 31
4

 
33

 

Intrinsic value of options exercised
45

 
13

 
6

Weighted-average grant date fair value per option
$
—

 
$
—

 
$
84.60
Summary of restricted stock units activity
A summary of RSUs granted follows (RSUs in thousands):
 
Year Ended December 31,  
 
2019
 
2018
 
2017
RSUs granted
456

 
566

 
809

Weighted-average grant date price per unit
$
124.37

 
$
175.79

 
$
130.96


A summary of RSU activity for the year ended December 31, 2019 follows (RSUs in thousands):  
 
Stock Units
 
Weighted-Average
Grant Date Fair Value
Nonvested as of December 31, 2018
649

 
$
116.26

Granted
456

 
124.37

Vested
(611
)
 
129.50

Forfeited
(33
)
 
147.91

Nonvested as of December 31, 2019
461

 
$
104.40