9. STOCKHOLDERS’ EQUITY AND EQUITY COMPENSATION PLANS

Stock Repurchase Program. We currently have a stock repurchase program, approved by our Board, authorizing us to repurchase our common stock from time-to-time as market and business conditions warrant (the “Stock Repurchase Program”). During the first quarters of 2018 and 2017 we repurchased 0.1 million shares of our common stock for $5.7 million (weighted-average price of $45.78 per share) and 0.1 million shares of our common stock for $5.4 million (weighted-average price of $42.85 per share), respectively, under a SEC Rule 10b5-1 Plan.

As of March 31, 2018, the total remaining number of shares available for repurchase under the Stock Repurchase Program totaled 6.1 million shares.

Stock Repurchases for Tax Withholdings. In addition to the above mentioned stock repurchases, during the first quarters of 2018 and 2017 , we repurchased and then cancelled 0.1 million shares of common stock for $6.2 million and 0.2 million shares of common stock for $6.1 million, respectively, in connection with minimum tax withholding requirements resulting from the vesting of restricted common stock under our stock incentive plans.

Cash Dividends. During the first quarter of 2018, the Board approved a quarterly cash dividend of $0.21 per share of common stock, totaling $7.1 million. During the first quarter of 2017, the Board approved a quarterly cash dividend of $0.1975 per share of common stock, totaling $6.7 million.

Warrants. In 2014, in conjunction with the execution of an amendment to our current agreement with Comcast, we issued stock warrants (the “Warrant Agreement”) for the right to purchase up to approximately 2.9 million shares of our common stock (the “Stock Warrants”) as an additional incentive for Comcast to convert customer accounts onto our Advanced Convergent Platform based on various milestones. The Stock Warrants have a 10-year term and an exercise price of $26.68 per warrant.

Upon vesting, the Stock Warrants are recorded as a client contract incentive asset with the corresponding offset to stockholders’ equity. The client contract incentive asset related to the Stock Warrants is amortized as a reduction in cloud and related solutions revenues over the remaining term of the Comcast amended agreement. As of March 31, 2018 and December 31, 2017, we recorded a client contract incentive asset related to these Stock Warrants of $25.1 million as of both periods and have recorded accumulated amortization related to these Stock Warrants of $11.8 million and $9.2 million, respectively. The remaining unvested Stock Warrants will be accounted for as client contract incentive assets in the period the performance conditions necessary for vesting have been met.

As of March 31, 2018, approximately 1.4 million Stock Warrants remain issued, of which 0.4 million were vested.

Stock-Based Awards. A summary of our unvested restricted common stock activity during the quarter ended March 31, 2018 is as follows (shares in thousands):

	Quarter Ended
	March 31, 2018
	Shares			Weighted- Average Grant Date Fair Value
Unvested awards, beginning		1,222		$	36.84
Awards granted		450			47.01
Awards forfeited/cancelled		(59	)		39.72
Awards vested		(397	)		33.76
Unvested awards, ending		1,216		$	41.48

Included in the awards granted during the first quarter of 2018 are performance-based awards for 0.1 million restricted common stock shares issued to members of executive management and certain key employees, which vest in the first quarter of 2020 upon meeting certain pre-established financial performance objectives related to 2019 performance. The performance-based awards become fully vested upon a change in control, as defined, and the subsequent involuntary termination of employment.

All other restricted common stock shares granted during the first quarter of 2018 are time-based awards, which vest annually over four years with no restrictions other than the passage of time. Certain shares of the restricted common stock become fully vested upon a change in control, as defined, and the subsequent involuntary termination of employment.

We recorded stock-based compensation expense for the first quarters of 2018 and 2017 of $4.6 million and $5.7 million, respectively.