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STOCK AWARD PLANS | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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,
| 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 |
On May 12, 2016, our shareholders approved an amendment to and restatement of our 2013 Equity Incentive Plan, which 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 13,041,803 shares can be granted under this plan. Approximately 1,421,642 shares were available for stock awards under the plan as of March 31, 2019. 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 time-based and performance-based stock options to certain key employees. These options are subject to certain vesting requirements over a five-year period based on the company’s earnings growth or on the employees continued employment. Any options remaining unvested at the end of the five-year vesting period are forfeited to the company. Although participants can exercise options via a stock swap exercise, we do not issue reloads (restoration options) on the grants. The fair value of these options is established based on the market price on the date of grant, discounted for post-vesting holding restrictions, calculated using the Black-Scholes option pricing model. Changes in 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. As of March 31, 2019, unrecognized compensation expense related to stock options was $51.7 million. The amount of future expense to be recognized will be based on the passage of time, the company’s earnings growth, and certain other conditions. Full Value Awards - We have awarded performance-based shares and restricted stock units to certain key employees and non-employee directors. These awards are subject to certain vesting requirements over a five-year period, based on our earnings growth. 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 15 percent to 21 percent and are calculated using the Black-Scholes option pricing model-protective put method. Changes in 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 have also awarded time-based restricted shares and restricted stock units to certain key employees that vest primarily based on their continued employment. The value of these awards is established by the market price on the date of the grant, discounted for post-vesting holding restrictions and is being expensed over the vesting period of the award. We have also issued to certain key employees and non-employee directors restricted stock units 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, 2019, there was unrecognized compensation expense of $107.4 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 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:
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 The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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