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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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, 2017
549

 
26.80

Granted
—

 
—

Exercised
(85
)
 
23.26

Canceled
(1
)
 
19.67

Outstanding at December 31, 2018
463

 
27.47

Exercisable at December 31, 2018
433

 
$
25.38

The following table presents information associated with stock options as of December 31, 2018 and 2017, and for the years ended December 31, 2018, 2017 and 2016:
 
2018
 
2017
 
2016
Intrinsic value of options outstanding as of December 31
$
35

 
$
80

 

Intrinsic value of options exercisable as of December 31
33

 
72

 

Intrinsic value of options exercised
13

 
6

 
4

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,  
 
2018
 
2017
 
2016
RSUs granted
566

 
809

 
901

Weighted-average grant date price per unit
$
175.79

 
$
130.96

 
$
60.55

A summary of RSU activity for the year ended December 31, 2018 follows (RSUs in thousands):  
 
Stock Units
 
Weighted-Average
Grant Date Fair Value
Nonvested as of December 31, 2017
756

 
$
94.07

Granted
566

 
175.79

Vested
(638
)
 
141.89

Forfeited
(35
)
 
132.14

Nonvested as of December 31, 2018
649

 
$
116.26