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STOCK AWARD PLANS (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2021202020212020
Stock options$4,027 $5,025 $7,994 $10,038 
Stock awards24,401 5,291 43,349 10,694 
Company expense on ESPP discount733 638 1,807 1,619 
Total stock-based compensation expense$29,161 $10,954 $53,150 $22,351 
Schedule Employee Stock Purchase Plan Activity The following is a summary of the employee stock purchase plan activity (dollars in thousands): 
Three Months Ended June 30, 2021
Shares purchased
by employees
Aggregate cost
to employees
Expense recognized
by the company
52,157 $4,153 $733