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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY [Parenthetical]
3 Months Ended
Mar. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 15,000
Common Stock Class A [Member]  
Stock Repurchased During Period, Shares 22,380
Common Stock Class D [Member]  
Stock Repurchased During Period, Shares 1,220,657
Conversion of Stock, Shares Converted 755,239