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Stock Incentive Plans and Stock Purchase Plans
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Incentive Plans and Stock Purchase Plans
9. Stock Incentive Plans and Stock Purchase Plans:

The Company’s Amended and Restated 2008 Incentive Compensation Plan, as amended (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. The Company recognizes compensation expense related to its restricted stock awards ratably over the corresponding vesting periods. During the nine months ended September 30, 2016, the Company granted 501,325 shares of restricted stock to its employees and non-employee directors under the Amended and Restated 2008 Incentive Plan. At September 30, 2016, the Company had approximately 4.5 million shares available for future grants and awards under its Amended and Restated 2008 Incentive Plan.

Under the Company’s 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, beginning upon the SPP’s effective date of January 1, 2016.

Each of the ESPP and the SPP provide for the issuance of an aggregate of 2.5 million shares of the Company’s common stock less the number of shares of common stock purchased under the other plan. In accordance with the provisions of the accounting guidance for stock-based compensation, 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, 2016, 226,798 shares were issued under the ESPP and SPP. At September 30, 2016, the Company had approximately 2.4 million shares in aggregate reserved for issuance under the ESPP and SPP.

During the three and nine months ended September 30, 2016 and 2015, the Company recognized approximately $8.7 million and $25.9 million, and $8.2 million and $24.0 million, respectively, of stock-based compensation expense. The net excess tax benefit recognized in additional paid-in capital related primarily to restricted stock and stock options for the nine months ended September 30, 2016 was approximately $3.3 million.