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Stock Based Compensation | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Stock Based Compensation | Stock Based Compensation The Company’s share-based compensation plans include the 2007 Stock Plan (the “2007 Plan”), 2015 Stock Option Plan (the “2015 Plan”) and 2001 Employee Stock Purchase Plan (the “Purchase Plan”). Each plan is described below. The 2007 Plan provides for the granting of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units and other share-based awards. 4,500,000 shares of the Company’s common stock are authorized to be used for 2007 Plan purposes. Options under the 2007 Plan may be granted at exercise prices determined by the Board of Directors, provided that the exercise prices shall not be less than the fair market value of the Company’s common stock on the date of grant for incentive stock options and not less than 85% of the fair market value of the Company’s common stock on the date of grant for non-statutory stock options. As of June 30, 2022, zero shares underlying options and zero shares of restricted stock units were outstanding under the 2007 Plan. The 2007 Plan terminated on February 14, 2017. The 2015 Plan provides for the granting of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance share units and other share-based awards. 4,200,000 shares of the Company’s common stock are authorized to be used for 2015 Plan purposes. Options under the 2015 Plan may be granted at exercise prices determined by the Board of Directors, provided that the exercise prices shall not be less than the higher of the par value or 100% of the fair market value of the Company’s common stock subject to the option on the date the option is granted. As of June 30, 2022, 435,135 shares underlying options and 506,962 shares of restricted stock units were outstanding under the 2015 Plan. The Company has awarded restricted stock and restricted stock units to its Board of Directors and senior staff pursuant to certain share-based compensation plans. Compensation expense resulting from restricted stock and restricted unit grants is measured at fair value on the date of grant and is recognized as share-based compensation expense over the applicable vesting period. Vesting periods are approximately one year for awards to members of the Company’s Board of Directors, four or five years for senior staff (excluding market-based awards discussed below) and four to eight years for the Chief Executive Officer. The Company granted 132,117 and 90,286 shares of restricted stock and restricted units (excluding awards with market conditions below) during the six months ended June 30, 2022 and 2021, respectively. The Company has awarded certain key employees market-based restricted stock awards pursuant to the 2015 Plan. The market-based awards have vesting conditions that are based on specified stock price targets of the Company’s common stock. Market conditions were factored into the grant date fair value using a Monte Carlo valuation model, which utilized multiple input variables to determine the probability of the Company achieving the specified stock price targets with a 20-day and 30-day lookback (trading days). Stock-based compensation expense related to an award with a market condition will be recognized over the requisite service period using the graded-vesting method regardless of whether the market condition is satisfied, provided that the requisite service period has been completed. During the six months ended June 30, 2022 and 2021, the Company awarded 100,193 and 73,094 market-based restricted stock awards, respectively. The per share weighted average grant-date fair values of the market-based restricted stock awards granted during the six months ended June 30, 2022 and 2021 were $87.11 and $94.40, respectively. The weighted-average fair values of market-based restricted stock awards granted have been estimated utilizing the following assumptions:
| June 30, 2022 |  | June 30, 2021
Underlying stock price at valuation date | $ | 99.32 |  |  | $ | 113.27 |
Expected volatility | 36.7 | % |  | 30.3 | %
Risk-free interest rate | 1.8 | % |  | 1.3 | %
Restricted stock award activity for the six months ended June 30, 2022 is set forth below:
| Shares |  | Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2022 | 383,963 |  |  | $ | 62.65 |
Granted | — |  |  | — |
Vested | (61,073) |  |  | 80.67 |
Canceled | (1,605) |  |  | 93.75 |
Nonvested at June 30, 2022 | 321,285 |  |  | $ | 60.36 |
Restricted stock unit activity for the six months ended June 30, 2022 is set forth below:
| Number of Shares |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2022 | 360,743 |  |  |  |  |
Granted | 232,310 |  |  |  |  |
Vested | (73,433) |  |  |  |  |
Canceled | (12,658) |  |  |  |  |
Outstanding at a June 30, 2022 | 506,962 |  |  | 2.9 |  | $ | 37,783,878 |
Vested and expected to vest at June 30, 2022 | 506,962 |  |  | 2.9 |  | $ | 37,783,878 |
As of June 30, 2022 and December 31, 2021, the Company had unrecognized share-based compensation cost of approximately $52.9 million and $44.3 million, respectively, associated with these restricted stock awards and restricted stock units. This cost is expected to be recognized over a weighted-average period of 3.2 for restricted stock awards and 3.9 for restricted stock units. Employee Stock Purchase Plan The Purchase Plan provides for the issuance of a maximum of two million shares of the Company’s common stock. Under the Purchase Plan, eligible employees can have up to 15% of their earnings withheld, up to certain maximums, to be used to purchase shares of the Company’s common stock at certain plan-defined dates. The price of the Company’s common stock purchased under the Purchase Plan for the offering periods is equal to 85% of the lesser of the fair market value of a share of common stock of the Company on the beginning or the end of the offering period. The Company determined that a plan provision exists which allows for the more favorable of two exercise prices, commonly referred to as a “look-back” feature. The purchase price discount and the look-back feature cause the Purchase Plan to be compensatory and the Company to recognize compensation expense. The compensation cost is recognized on a straight-line basis over the requisite service period. The Company used the Black-Scholes option pricing model to calculate the estimated fair value of the purchase right issued under the ESPP. The expected volatility is based on historical volatility of the Company’s common stock. The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a term equal to the expected term of the option assumed at the date of grant. The Company uses an annualized dividend yield based upon the per share dividends declared by its Board of Directors. Estimated forfeiture rates were 11.15% and 11.15% as of June 30, 2022 and 2021, respectively. The increase in forfeiture rate comes as a result of the Purchase Plan being offered to all employees regardless of employment location. For the six months ended June 30, 2022 and 2021, 76,741 and 58,145 shares were purchased under the Purchase Plan, respectively. Cash received upon the issuance of the Company’s common stock under the Purchase Plan was $5.2 million and $4.2 million for the six months ended June 30, 2022 and 2021, respectively. As of June 30, 2022, 1,218,950 shares were available under the Purchase Plan for future issuance. The Company recognized $0.8 million and $0.7 million of compensation expense related to the Purchase Plan for the three months ended June 30, 2022 and 2021, respectively, and $1.5 million and $1.3 million for the six months ended June 30, 2022 and 2021, respectively. The compensation expense related to the Purchase Plan has been estimated utilizing the following assumptions:
| June 30, 2022 |  | June 30, 2021
Risk-free interest rate | 1.54 | % |  | 0.02 | %
Expected term (in years) | 0.5 |  | 0.5
Dividend yield | 0.00 | % |  | 0.00 | %
Expected volatility | 41.6 | % |  | 29.5 | %
Weighted average volatility | 41.6 | % |  | 29.5 | %

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