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Shareholders' Equity Preferred Stock (Details) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Equity [Abstract]    
Preferred stock, shares authorized (in share) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, no par value (in dollars per share) $ 0