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STOCK AWARD PLANS (Tables) | 9 Months Ended
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Sep. 30, 2019
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock options | $ | 4,829 |  |  | $ | 5,666 |  |  | $ | 13,539 |  |  | $ | 17,931 |
Stock awards | 3,470 |  |  | 17,539 |  |  | 24,798 |  |  | 48,443 |
Company expense on ESPP discount | 551 |  |  | 566 |  |  | 2,320 |  |  | 2,101 |
Total stock-based compensation expense | $ | 8,850 |  |  | $ | 23,771 |  |  | $ | 40,657 |  |  | $ | 68,475 |
Schedule Employee Stock Purchase Plan Activity | The following is a summary of the employee stock purchase plan activity:
Three Months Ended September 30, 2019
Shares purchased by employees |  | Aggregate cost to employees |  | Expense recognized by the company
45,098 |  |  | $ | 3,121,126 |  |  | $ | 550,787 |

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