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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Schedule of common and preferred stock activity
The Common and Preferred Stock Activity table below contains additional information about preferred stock conversions during 2019, 2018 and 2017:
 
Common and Preferred Stock Activity:
Preferred Stock
 
Common stock
(in shares)
Series A Convertible
 
Treasury
 
Outstanding
Beginning balance as of December 31, 2016
75,625

 
7,186,521

 
87,250,897

Repurchase of common stock
—

 
—

 
—

Conversion of convertible preferred stock
(1,261
)
 
—

 
126,098

Issuance for share-based compensation plans
—

 
—

 
167,782

Ending balance as of December 31, 2017
74,364


7,186,521

 
87,544,777

Repurchase of common stock
—

 
—

 
—

Conversion of convertible preferred stock
(2,397
)
 
—

 
239,748

Issuance for share-based compensation plans
—

 
—

 
318,915

Balance as of December 31, 2018
71,967

 
7,186,521

 
88,103,440

Repurchase of common stock
—

 
—

 
—

Conversion of convertible preferred stock
(4,644
)
 
—

 
464,431

Issuance for share-based compensation plans
—

 
—

 
617,790

Ending balance as of December 31, 2019
67,323

 
7,186,521

 
89,185,661