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STOCK AWARD PLANS (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation A summary of our total compensation expense recognized in our condensed consolidated statements of operations and comprehensive income for stock-based compensation is as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Stock options$4,070 $5,081 $12,064 $15,119 
Stock awards36,012 5,042 79,361 15,736 
Company expense on ESPP discount730 653 2,537 2,272 
Total stock-based compensation expense$40,812 $10,776 $93,962 $33,127 
Schedule Employee Stock Purchase Plan Activity The following is a summary of the employee stock purchase plan activity (dollars in thousands): 
Three Months Ended September 30, 2021
Shares purchased
by employees
Aggregate cost
to employees
Expense recognized
by the company
55,904 $4,134 $730