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Shareholders' Equity - Preferred stock authorized for issuance (Details)
Sep. 30, 2019
$ / shares
shares
Voting Preferred Stock  
Class of Stock [Line Items]  
Preferred Stock, shares authorized | shares 12,500,000
Preferred Stock, par value (in USD per share) | $ / shares $ 0
Nonvoting Preferred Stock  
Class of Stock [Line Items]  
Preferred Stock, shares authorized | shares 12,500,000
Preferred Stock, par value (in USD per share) | $ / shares $ 0