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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - $ / shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Common Class A    
Cash dividend on Class A and Class B common stock (in dollars per share) $ 0.20 $ 0.18
Common Class B    
Cash dividend on Class A and Class B common stock (in dollars per share) $ 0.20 $ 0.18