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STOCK AWARD PLANS (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | 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 March 31,
| 2019 |  | 2018
Stock options | $ | 4,249 |  |  | $ | 5,002 |
Stock awards | 11,744 |  |  | 12,212 |
Company expense on ESPP discount | 1,130 |  |  | 920 |
Total stock-based compensation expense | $ | 17,123 |  |  | $ | 18,134 |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity | The following is a summary of the employee stock purchase plan activity:
Three Months Ended March 31, 2019
Shares purchased by employees |  | Aggregate cost to employees |  | Expense recognized by the company
86,588 |  |  | $ | 6,403,183 |  |  | $ | 1,129,973 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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