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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising and Promotional Expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Advertising and promotional expenses $ 345.7 $ 391.6 $ 353.9