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STOCK AWARD PLANS (Tables)
 9 Months Ended
Sep. 30, 2020
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,
2020201920202019
Stock options$5,081 $4,829 $15,119 $13,539 
Stock awards5,042 3,470 15,736 24,798 
Company expense on ESPP discount653 551 2,272 2,320 
Total stock-based compensation expense$10,776 $8,850 $33,127 $40,657 
Schedule Employee Stock Purchase Plan Activity The following is a summary of the employee stock purchase plan activity: 
Three Months Ended September 30, 2020
Shares purchased
by employees
Aggregate cost
to employees
Expense recognized
by the company
42,445 $3,699,626 $652,875