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 2021 and 2020 we repurchased approximately 142,000 shares of our common stock for $6.5 million (weighted-average price of $45.94 per share) and approximately 142,000 shares of our common stock for $6.4 million (weighted-average price of $45.26 per share), respectively, under a SEC Rule 10b5-1 Plan.

As of March 31, 2021, the total remaining number of shares available for repurchase under the Stock Repurchase Program totaled 4.2 million shares.

Stock Repurchases for Tax Withholdings. In addition to the above-mentioned stock repurchases, during the first quarters of 2021 and 2020 we repurchased and then cancelled approximately 110,000 shares of common stock for $5.2 million and approximately 157,000 shares of common stock for $7.6 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 2021, the Board approved a quarterly cash dividend of $0.25 per share of common stock, totaling $8.2 million. During the first quarter of 2020, the Board approved a quarterly cash dividend of $0.235 per share of common stock, totaling $7.7 million.

Warrants. In 2014, in conjunction with the execution of an amendment to our current agreement with Comcast Corporation (“Comcast”), we issued stock warrants (the “Warrant Agreement”) for the right to purchase up to 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 (“ACP”) based on various milestones. The Stock Warrants have a ten-year term and an exercise price of $26.68 per warrant.

As of March 31, 2021, 1.0 million Stock Warrants remain issued, none of which were vested. The remaining unvested Stock Warrants will be accounted for as a customer contract cost asset once the performance conditions necessary for vesting are considered probable.

Stock-Based Awards. A summary of our unvested restricted common stock activity during the first quarter of 2021 is as follows (shares in thousands):

	Quarter Ended
	March 31, 2021
	Shares			Weighted- Average Grant Date Fair Value
Unvested awards, beginning		1,041		$	41.31
Awards granted		513			47.88
Awards forfeited/cancelled		(2	)		40.81
Awards vested		(340	)		41.65
Unvested awards, ending		1,212		$	43.87

Included in the awards granted during the first quarter of 2021 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 2023 upon meeting certain pre-established financial performance objectives over a two-year performance period. Certain of these awards become fully vested upon a change in control, as defined, and the subsequent involuntary termination of employment.

The other restricted common stock shares granted during the first quarter of 2021 are primarily 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, or death.

We recorded stock-based compensation expense for the first quarters of 2021 and 2020 of $5.4 million and $4.9 million, respectively.