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STOCK AWARD PLANS - Employee Stock Purchase Plan Activity (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares purchased by employees (shares) 55,904      
Aggregate cost to employees $ 4,134      
Expense recognized by the company 40,812 $ 10,776 $ 93,962 $ 33,127
Company expense on ESPP discount        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense recognized by the company $ 730 $ 653 $ 2,537 $ 2,272