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Stockholders' Equity
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Stockholders' Equity Stockholders’ Equity
During the years ended December 31, 2022, 2021 and 2020, we issued an aggregate of 789,870, 1,179,032 and 4,705,843 shares of common stock, respectively, in connection with the exercises of stock options, for net proceeds of approximately $15.3 million, $16.6 million and $66.2 million, respectively. For the years ended December 31, 2022, 2021 and 2020, we issued 254,907, 299,958 and 571,963 shares of common stock, respectively, upon vesting of certain RSUs and PSUs for which the RSU holders surrendered 68,425, 94,795 and 142,905 RSUs, respectively, to pay for minimum withholding taxes totaling approximately $4.4 million, $8.2 million and $5.5 million, respectively. Stock options and unvested restricted units totaling approximately 6.6 million, 5.9 million and 6.7 million shares of our common stock were outstanding as of December 31, 2022, 2021 and 2020, respectively.
Share Repurchases
In November 2019, the Board of Directors authorized a capital return program to repurchase up to $550.0 million of outstanding common stock over a three-year period. During 2020, we repurchased 6.5 million shares of common stock for $150.0 million at an average price of $23.05. During 2021, we repurchased 4.6 million shares of common stock for $200.0 million at an average price of $43.02 under the program. The shares were purchased through open market transactions and through an ASR agreement. The $550.0 million share repurchase program was completed in October 2021 having repurchased a total of 22.3 million shares at an average price of $24.72.
In December 2021, the Board of Directors authorized a second capital return program to repurchase up to $750.0 million of outstanding stock over a three-year period. Also in December 2021, as part of the second capital return program, we entered into an ASR agreement to repurchase $150.0 million of common stock. At inception pursuant to the agreement, we paid $150.0 million and took initial delivery of 3.5 million shares. In June 2022, we finalized the transaction and received an additional 0.4 million shares.
In August 2022, concurrent with the sale of 2028 Convertible Notes and the 2022 Induced Conversion, we repurchased 2.1 million shares of common stock in open market purchases for $90.2 million. Also, in August 2022, we entered into an ASR agreement to repurchase $109.8 million of our common stock. At inception, pursuant to the agreement, we paid $109.8 million and took an initial delivery of 2.0 million shares. In December 2022, we finalized the transaction and received an additional 0.4 million shares. We retired the repurchased shares and they resumed their status of authorized and unissued shares.
We had the following activity under the approved share repurchase programs (dollars in thousands, except share and per share data)
2022
Total Number of Shares PurchasedWeighted Average Price paid Per Share
Total Cost(1)
First quarter— $0.00$0
Second quarter— $0.00$0
Third quarter(2)
4,500,216 $44.44$200,000
Fourth quarter— $0.00$0
4,500,216 $44.44$200,000

(1) Included in the total cost of shares purchased is a commission fee of $0.02 per share.
(2) Included is 0.4 million shares delivered in December 2022 upon completion of the ASR.