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Stock Incentive Plans and Stock Purchase Plans | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock Incentive Plans and Stock Purchase Plans | 8. Stock Incentive Plans and Stock Purchase Plans: The Company’s Amended and Restated 2008 Incentive Compensation Plan (the “Amended and Restated 2008 Incentive Plan”) provides for grants of stock options, stock appreciation rights, restricted stock, deferred stock, and other stock-related awards and performance awards that may be settled in cash, stock or other property. Under the Amended and Restated 2008 Incentive Plan, options to purchase shares of common stock may be granted at a price not less than the fair market value of the shares on the date of grant. The options must be exercised within 10 years from the date of grant and generally become exercisable on a pro rata basis over a three-year period from the date of grant. The Company issues new shares of its common stock upon exercise of its stock options. Restricted stock awards generally vest over periods of three years upon the fulfillment of specified service-based conditions and in certain instances performance-based conditions. Deferred stock awards generally vest upon the satisfaction of specified performance-based conditions and service-based conditions. The Company recognizes compensation expense related to its restricted stock and deferred stock awards ratably over the corresponding vesting periods. During the nine months ended September 30, 2023, the Company granted 0.8 million shares of restricted stock to its employees and non-employee directors under the Amended and Restated 2008 Incentive Plan. At September 30, 2023, the Company had 8.1 million shares available for future grants and awards under the Amended and Restated 2008 Incentive Plan. Under the Company’s Amended and Restated 1996 Non-Qualified Employee Stock Purchase Plan, as amended (the “ESPP”), employees are permitted to purchase the Company's common stock at 85% of market value on January 1st, April 1st, July 1st and October 1st of each year. Under the Company’s 2015 Non-Qualified Stock Purchase Plan (the “SPP”), certain eligible non-employee service providers are permitted to purchase the Company’s common stock at 90% of market value on January 1st, April 1st, July 1st and October 1st of each year. The Company recognizes stock-based compensation expense for the discount received by participating employees and non-employee service providers. During the nine months ended September 30, 2023, approximately 0.3 million shares were issued under the ESPP. At September 30, 2023, the Company had approximately 2.2 million shares reserved for issuance under the ESPP. At September 30, 2023, the Company had approximately 61,000 shares in the aggregate reserved for issuance under the SPP. No shares have been issued under the SPP since 2020. During the three and nine months ended September 30, 2023 and 2022, the Company recognized stock-based compensation expense of $3.2 million and $9.3 million and $4.1 million and $12.9 million, respectively.

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