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Shareholders’ Equity (Tables)
9 Months Ended
Sep. 30, 2020
Stockholders' Equity Note [Abstract]  
Common and Preferred Stock Activity
The Common and Preferred Stock table below contains additional information about preferred stock conversions during the nine months ended September 30, 2020 and 2019.
Preferred stock  Common stock
Common and Preferred Stock Activity (in shares):Series A Convertible   Treasury  Outstanding
Beginning balance as of December 31, 2019
67,323 7,186,521 89,185,661 
Conversion of convertible preferred stock(1,284)— 128,389 
Issuance for share-based compensation plans— — 170,784 
Ending balance as of September 30, 2020
66,039 7,186,521 89,484,834 
Beginning balance as of December 31, 2018
71,967 7,186,521 88,103,440 
Conversion of convertible preferred stock(3,392)— 339,166 
Issuance for share-based compensation plans— — 451,161 
Ending balance as of September 30, 2019
68,575 7,186,521 88,893,767