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STOCK AWARD PLANS | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
STOCK AWARD PLANS | STOCK AWARD PLANS Stock-based compensation cost is measured at the grant date based on the value of the award and is recognized as expense as it vests. 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,
|  |  |  |  | 2021 |  | 2020
Stock options |  |  |  |  | $ | 3,967 |  |  | $ | 5,013 |
Stock awards |  |  |  |  | 18,948 |  |  | 5,403 |
Company expense on ESPP discount |  |  |  |  | 1,074 |  |  | 981 |
Total stock-based compensation expense |  |  |  |  | $ | 23,989 |  |  | $ | 11,397 |
On May 9, 2019, our shareholders approved an amendment and restatement of our 2013 Equity Incentive Plan (the “Plan”) to increase the number of shares authorized for award by 4,000,000 shares. The Plan allows us to grant certain stock awards, including stock options at fair market value and performance shares and restricted stock units, to our key employees and outside directors. A maximum of 17,041,803 shares can be granted under this plan following the amendment and restatement. Approximately 1,782,168 shares were available for stock awards under the plan as of March 31, 2021. Shares subject to awards that expire or are canceled without delivery of shares or that are settled in cash generally become available again for issuance under the plan. Stock Options - We have awarded stock options to certain key employees through 2020. The fair value of these options was established based on the market price on the date of grant calculated using the Black-Scholes option pricing model. Changes in measured stock price volatility and interest rates were the primary reasons for changes in the fair value. These grants are being expensed based on the terms of the awards. As of March 31, 2021, unrecognized compensation expense related to stock options was $38.8 million. The amount of future expense to be recognized will be based on the passage of time and the employees' continued employment. Stock Awards - We have awarded performance-based restricted shares through 2020. We have also awarded performance-based restricted stock units and time-based restricted stock units to certain key employees and non-employee directors. Performance-based awards are subject to certain vesting requirements based on our earnings and adjusted gross profit growth. Time-based awards vest primarily based on the employee's continued employment. The awards also contain restrictions on the awardees’ ability to sell or transfer vested awards for a specified period of time. The fair value of these awards is established based on the market price on the date of grant, discounted for post-vesting holding restrictions. The discounts on outstanding grants vary from 12 percent to 23 percent and are calculated using the Black-Scholes option pricing model-protective put method. Differences in post-holding restrictions, measured stock price volatility and interest rates are the primary reasons for changes in the discount. These grants are being expensed based on the terms of the awards. We granted 280,255 performance-based restricted stock units and 619,689 time-based restricted stock units on February 3, 2021. The performance-based and time-based awards had a weighted average grant date fair value of $74.76 and $71.28, respectively, and are eligible to vest over a three-year period with a first vesting date of December 31, 2021. The performance-based awards vest based on our earnings and adjusted gross profit growth and include an upside opportunity of 200% upon attaining established earnings and adjusted gross profit growth targets. We have also issued restricted stock units to certain key employees and non-employee directors, which are fully vested upon issuance. These units contain restrictions on the awardees’ ability to sell or transfer vested units for a specified period of time. The fair value of these units is established using the same method discussed above. These grants have been expensed during the year they were earned. As of March 31, 2021, there was unrecognized compensation expense of $157.0 million related to previously granted full value awards. The amount of future expense to be recognized will be based on the passage of time, the company’s earnings and adjusted gross profit growth, and certain other conditions. Employee Stock Purchase Plan - Our 1997 Employee Stock Purchase Plan ("ESPP") allows our employees to contribute up to $10,000 of their annual cash compensation to purchase company stock. Purchase price is determined using the closing price on the last day of each quarter discounted by 15 percent. Shares vest immediately. The following is a summary of the employee stock purchase plan activity (dollars in thousands):
Three Months Ended March 31, 2021
Shares purchased by employees |  | Aggregate cost to employees |  | Expense recognized by the company
75,029 |  |  | $ | 6,086 |  |  | $ | 1,074 |

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