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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2020
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):  
SharesWeighted-Average
Exercise Price
Outstanding at December 31, 201937 50.40 
Granted— — 
Exercised(26)45.88 
Canceled(1)43.63 
Outstanding at December 31, 202010 61.93 
Exercisable at December 31, 202010 $61.93 
The following table presents information associated with stock options as of December 31, 2020 and 2019, and for the years ended December 31, 2020, 2019 and 2018:
202020192018
Intrinsic value of options outstanding as of December 31$2 $4 
Intrinsic value of options exercisable as of December 312 4 
Intrinsic value of options exercised3 45 13 
Weighted-average grant date fair value per option$— $— $— 
Summary of restricted stock units activity A summary of RSUs granted follows (RSUs in thousands):
Year Ended December 31,  
202020192018
RSUs granted643 456 566 
Weighted-average grant date price per unit$140.99 $124.37 $175.79 
A summary of RSU activity for the year ended December 31, 2020 follows (RSUs in thousands):  
Stock UnitsWeighted-Average
Grant Date Fair Value
Nonvested as of December 31, 2019461 $104.40 
Granted643 140.99 
Vested(520)138.48 
Forfeited(67)135.44 
Nonvested as of December 31, 2020517 $164.62