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STOCK AWARD PLANS - Summary of Employee Stock Purchase Plan Activity (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares purchased by employees (shares) 45,098      
Aggregate cost to employees $ 3,121,126      
Expense recognized by the company 8,850,000 $ 23,771,000 $ 40,657,000 $ 68,475,000
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense recognized by the company $ 550,787 $ 566,000 $ 2,320,000 $ 2,101,000