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Share-based Compensation | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Share-based Compensation | Share-based Compensation We have share-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company. The Fifth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's Board of Directors in April 2022 and its stockholders in June 2022 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights, cash-based awards and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 32,210,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) counting as 2.59 Fungible Units per share subject to such awards, (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.84 fungible units per share subject to such awards, and (3) all other awards (e.g., 10-year stock options) counting as 1.0 fungible units per share subject to such awards. Awards granted under the 2005 Plan prior to the approval of the fifth amendment and restatement in June 2022 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 32,210,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of our common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's Board of Directors, new awards may be granted under the 2005 Plan until June 1, 2032, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of December 31, 2023, 3.9 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units. Stock Options and Class O LTIP Units Options are granted with an exercise price at the fair market value of the Company's common stock on the date of grant and, subject to employment, generally expire five years or ten years from the date of grant, are not transferable other than on death, and generally vest in one year to five years commencing one year from the date of grant. We have also granted Class O LTIP Units, which are a class of LTIP Units in the Operating Partnership structured to provide economics similar to those of stock options. Class O LTIP Units, once vested, may be converted, at the election of the holder, into a number of common units of the Operating Partnership per Class O LTIP Unit determined by the increase in value of a share of the Company’s common stock at the time of conversion over a participation threshold, which equals the fair market value of a share of the Company’s common stock at the time of grant. Class O LTIP Units are entitled to distributions, subject to vesting, equal per unit to 10% of the per unit distributions paid with respect to the common units of the Operating Partnership. The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information. There were no options granted during the years ended December 31, 2023, 2022, and 2021. A summary of the status of the Company's stock options as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| Options Outstanding |  | Weighted Average Exercise Price |  | Options Outstanding |  | Weighted Average Exercise Price |  | Options Outstanding |  | Weighted Average Exercise Price
Balance at beginning of year | 313,480 |  |  | $ | 97.59 |  |  | 394,089 |  |  | $ | 100.56 |  |  | 761,686 |  |  | $ | 105.76 |
Exercised | — |  |  | — |  |  | — |  |  | — |  |  | (11,314) |  |  | 72.30 |
Lapsed or canceled | (197,500) |  |  | 84.14 |  |  | (80,609) |  |  | 112.14 |  |  | (356,283) |  |  | 112.56 |
Balance at end of year | 115,980 |  |  | $ | 103.52 |  |  | 313,480 |  |  | $ | 97.59 |  |  | 394,089 |  |  | $ | 100.56 |
Options exercisable at end of year | 115,980 |  |  | $ | 103.52 |  |  | 313,480 |  |  | $ | 97.59 |  |  | 394,089 |  |  | $ | 100.56 |
The remaining weighted average contractual life of the options outstanding was 3.0 years and the remaining average contractual life of the options exercisable was 3.0 years. During the years ended December 31, 2023, 2022, and 2021, we recognized no compensation expense related to options. As of December 31, 2023, there was no unrecognized compensation cost related to unvested stock options. Restricted Shares Shares are granted to certain employees, including our executives, and vesting occurs upon the completion of a service period or our meeting established financial performance criteria. Vesting occurs at rates ranging from 15% to 35% once performance criteria are reached. A summary of the Company's restricted stock as of December 31, 2023, 2022, and 2021 and changes during the years ended December 31, 2023, 2022, and 2021 are as follows:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Balance at beginning of year | 3,758,174 |  |  | 3,459,363 |  |  | 3,337,545 |
Granted | 337,350 |  |  | 314,995 |  |  | 141,515 |
Canceled | (6,350) |  |  | (16,184) |  |  | (19,697) |
Balance at end of year | 4,089,174 |  |  | 3,758,174 |  |  | 3,459,363 |
Vested during the year | 147,915 |  |  | 118,255 |  |  | 122,759 |
Compensation expense recorded | $ | 7,766,055 |  |  | $ | 10,133,905 |  |  | $ | 8,497,054 |
Total fair value of restricted stock granted during the year | $ | 15,789,540 |  |  | $ | 16,804,931 |  |  | $ | 9,214,531 |
The fair value of restricted stock that vested during the years ended December 31, 2023, 2022, and 2021 was $10.2 million, $9.7 million and $11.3 million, respectively. As of December 31, 2023, there was $20.2 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.3 years. We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $38.1 million and $45.0 million during the years ended December 31, 2023 and 2022, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third-party consultant determined that the fair value of the LTIP Units has a discount to our common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of December 31, 2023, there was $27.1 million of total unrecognized compensation expense related to the time-based and performance-based awards, which is expected to be recognized over a weighted average period of 1.6 years. During the years ended December 31, 2023, 2022, and 2021, we recorded compensation expense related to bonus, time-based and performance-based awards of $50.4 million, $43.5 million, and $41.9 million, respectively. For the years ended December 31, 2023, 2022, and 2021, $1.4 million, $1.8 million, and $2.1 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. Deferred Compensation Plan for Directors Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of our common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units. During the year ended December 31, 2023, 39,302 phantom stock units and 27,739 shares of common stock were issued to our Board of Directors. We recorded compensation expense of $2.7 million during the year ended December 31, 2023 related to the Deferred Compensation Plan. As of December 31, 2023, there were 230,295 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program. Employee Stock Purchase Plan In 2007, the Company's Board of Directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to provide equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of December 31, 2023, 224,159 shares of our common stock had been issued under the ESPP.

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