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COMMON STOCK (Tables)
6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Schedule of Stock by Class
 Shares of Common Stock Outstanding
 Class A
Common Stock
Class B
Common Stock
Balance at December 31, 2020290,573,672 185,895,903 
Conversion of Class B common stock to Class A common stock99,678 (99,678)
Option exercises918,764 — 
Repurchase and retirement of Class A common shares in connection with the Company's share repurchase plan (discussed above)(21,000,949)— 
Treasury shares reissued692,977 — 
Balance at June 30, 2021271,284,142 185,796,225