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Shareholders’ Equity (Tables)
6 Months Ended
Jun. 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 six months ended June 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 June 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 June 30, 2019
68,575  7,186,521  88,893,767