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STOCK AWARD PLANS (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2020201920202019
Stock options$5,025  $4,461  $10,038  $8,710  
Stock awards5,291  9,584  10,694  21,328  
Company expense on ESPP discount638  639  1,619  1,769  
Total stock-based compensation expense$10,954  $14,684  $22,351  $31,807  
Schedule Employee Stock Purchase Plan Activity The following is a summary of the employee stock purchase plan activity: 
Three Months Ended June 30, 2020
Shares purchased
by employees
Aggregate cost
to employees
Expense recognized
by the company
53,836  $3,617,779  $638,432