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STOCK AWARD PLANS (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock options | $ | 4,461 |  |  | $ | 7,263 |  |  | $ | 8,710 |  |  | $ | 12,265 |
Stock awards | 9,584 |  |  | 18,692 |  |  | 21,328 |  |  | 30,904 |
Company expense on ESPP discount | 639 |  |  | 615 |  |  | 1,769 |  |  | 1,535 |
Total stock-based compensation expense | $ | 14,684 |  |  | $ | 26,570 |  |  | $ | 31,807 |  |  | $ | 44,704 |
Schedule Employee Stock Purchase Plan Activity | The following is a summary of the employee stock purchase plan activity:
Three Months Ended June 30, 2019
Shares purchased by employees |  | Aggregate cost to employees |  | Expense recognized by the company
53,503 |  |  | $ | 3,621,065 |  |  | $ | 639,011 |

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