Stock Incentive Plans and Stock Purchase Plans	6 Months Ended
Jun. 30, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans and Stock Purchase Plans	9. Stock Incentive Plans and Stock Purchase Plans: On May 12, 2021, the Company’s shareholders approved the Company’s Amended and Restated 2008 Incentive Compensation Plan (the “Amended and Restated 2008 Incentive Plan”). The amendments, among other things, increased the number of shares of common stock reserved for delivery under the Amended and Restated 2008 Incentive Plan from 27,775,000 shares to 34,975,000 shares, as well as extended the expiration date to 10 years from the effective date of approval. 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 six months ended June 30, 2021, the Company granted 728,290 shares of restricted stock to its employees and non-employee directors under the Amended and Restated 2008 Incentive Plan. At June 30, 2021, the Company had 3.6 million shares available for future grants and awards under the Amended and Restated 2008 Incentive Plan. On May 12, 2021, the Company’s shareholders approved the Company’s Amended and Restated 1996 Non-Qualified Employee Stock Purchase Plan (the “ESPP”) to increase the number of shares issuable under the ESPP to 9.9 million shares. Under 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 six months ended June 30, 2021, approximately 0.1 million shares were issued under the ESPP. At June 30, 2021, the Company had approximately 0.4 million shares reserved for issuance under the ESPP. The SPP provides for the issuance of up to 100,000 shares of the Company’s common stock. At June 30, 2021, the Company had approximately 61,000 shares in the aggregate reserved for issuance under the SPP. No shares have been issued under the SPP in 2021. During the three and six months ended June 30, 2021 and 2020, the Company recognized stock-based compensation expense of $5.8 million and $6.4 million, and $9.5 million and $13.7 million, respectively.

Stock Incentive Plans and Stock Purchase Plans

6 Months Ended

Jun. 30, 2021

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Incentive Plans and Stock Purchase Plans

9. Stock Incentive Plans and Stock Purchase Plans:

On May 12, 2021, the Company’s shareholders approved the Company’s Amended and Restated 2008 Incentive Compensation Plan (the “Amended and Restated 2008 Incentive Plan”). The amendments, among other things, increased the number of shares of common stock reserved for delivery under the Amended and Restated 2008 Incentive Plan from 27,775,000 shares to 34,975,000 shares, as well as extended the expiration date to 10 years from the effective date of approval. 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 six months ended June 30, 2021, the Company granted 728,290 shares of restricted stock to its employees and non-employee directors under the Amended and Restated 2008 Incentive Plan. At June 30, 2021, the Company had 3.6 million shares available for future grants and awards under the Amended and Restated 2008 Incentive Plan.

On May 12, 2021, the Company’s shareholders approved the Company’s Amended and Restated 1996 Non-Qualified Employee Stock Purchase Plan (the “ESPP”) to increase the number of shares issuable under the ESPP to 9.9 million shares. Under 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 six months ended June 30, 2021, approximately 0.1 million shares were issued under the ESPP. At June 30, 2021, the Company had approximately 0.4 million shares reserved for issuance under the ESPP. The SPP provides for the issuance of up to 100,000 shares of the Company’s common stock. At June 30, 2021, the Company had approximately 61,000 shares in the aggregate reserved for issuance under the SPP. No shares have been issued under the SPP in 2021.

During the three and six months ended June 30, 2021 and 2020, the Company recognized stock-based compensation expense of $5.8 million and $6.4 million, and $9.5 million and $13.7 million, respectively.