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Share-Based Compensation | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Share-Based Compensation | Share-Based Compensation Our non-employee directors and key employees are granted share-based awards through our SICP. We record these share-based awards as compensation costs over the respective service period for which services are received in exchange for an award of equity or equity-based compensation. The compensation cost is based primarily on the fair value of the shares awarded, using the estimated fair value of each share on the date it was granted and the number of shares to be issued at the end of the service period. The table below presents the amounts included in net income related to share-based compensation expense for the three months ended March 31, 2022 and 2021:
|  | Three Months Ended |  |
|  | March 31, |  |
|  | 2022 |  | 2021 |  |  |  |
(in thousands) |  |  |  |  |  |  |  |
Awards to non-employee directors |  | $ | 234 |  |  | $ | 188 |  |  |  |  |
Awards to key employees |  | 1,979 |  |  | 1,688 |  |  |  |  |
Total compensation expense |  | 2,213 |  |  | 1,876 |  |  |  |  |
Less: tax benefit |  | (571) |  |  | (487) |  |  |  |  |
Share-based compensation amounts included in net income |  | $ | 1,642 |  |  | $ | 1,389 |  |  |  |  |
Non-employee Directors Shares granted to non-employee directors are issued in advance of the directors’ service periods and are fully vested as of the grant date. We record a deferred expense equal to the fair value of the shares issued and amortize the expense equally over a service period of one year. In May 2021, after the most recent election of directors, each of our non-employee directors received an annual retainer of 683 shares of common stock under the SICP for service as a director through the 2022 Annual Meeting of Stockholders; accordingly, 6,830 shares, with a weighted average fair value of $117.11 per share, were issued and vested in 2021. On October 15, 2021, a newly appointed member of the Board of Directors received a pro-rated retainer of 342 shares of common stock under the SICP to serve as a non-employee director through the 2022 Annual Meeting of Stockholders. These shares vested immediately upon issuance in October 2021, had a weighted average fair value of $129.09 per share, and will be expensed over the remaining service period ending on the date of the 2022 Annual Meeting of Stockholders. At March 31, 2022, there was approximately $0.1 million of unrecognized compensation expense related to shares granted to non-employee directors. This expense will be recognized over the remaining service period ending in May of 2022. Key Employees The table below presents the summary of the stock activity for awards to key employees for the three months ended March 31, 2022:
|  | Number of Shares |  | Weighted Average Fair Value
Outstanding—December 31, 2021 |  | 197,398 |  |  | $ | 94.15 |
Granted |  | 63,382 |  |  | $ | 123.68 |
Vested |  | (60,850) |  |  | $ | 90.60 |
Expired |  | 557 |  |  | $ | 91.42 |
Outstanding—March 31, 2022 |  | 200,487 |  |  | $ | 105.32 |
During the three months ended March 31, 2022, we granted awards of 63,382 shares of common stock to key employees under the SICP, including awards granted in February 2022 and to key employees appointed in officer positions. The shares granted are multi-year awards that will vest no later than the three-year service period ending December 31, 2024. All of these stock awards are earned based upon the successful achievement of long-term financial results, which are comprised of market-based and performance-based conditions or targets. The fair value of each performance-based condition or target is equal to the market price of our common stock on the grant date of each award. For the market-based conditions, we used the Monte Carlo valuation to estimate the fair value of each market-based award granted. In March 2022, upon the election by certain of our executive officers, we withheld shares with a value at least equivalent to each such executive officer’s minimum statutory obligation for applicable income and other employment taxes related to shares that vested and were paid in February 2022 for the performance period ended December 31, 2021, paid the balance of such awarded shares to each such executive officer net cash remitted to the appropriate taxing authorities. We withheld 21,832 shares, based on the value of the shares on their award date. Total combined payments for the employees’ tax obligations to the taxing authorities were approximately $2.8 million. At March 31, 2022, the aggregate intrinsic value of the SICP awards granted to key employees was approximately $27.6 million. At March 31, 2022, there was approximately $9.4 million of unrecognized compensation cost related to these awards, which will be recognized through 2024. Stock Options There were no stock options outstanding or issued during the three months ended March 31, 2022 and 2021.

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