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Stockholders' Equity (Narrative) (Details)
 12 Months Ended
Dec. 31, 2018
vote
shares
Dec. 31, 2017
shares
Class of Stock [Line Items]    
Common stock, number of votes | vote 1  
Preferred stock, shares authorized | shares 1,000,000 1,000,000
Preferred stock, shares outstanding | shares 0  
Common Class B    
Class of Stock [Line Items]    
Common stock, number of votes | vote 10  
Conversion ratio 1