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Stockholders' Equity
 9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Stockholders' Equity Stockholders’ EquityOn June 2, 2016, our Board of Directors authorized a stock repurchase program of up to $100.0 million (the “Repurchase Program”). On each of May 18, 2017, December 1, 2017, February 21, 2019 and February 20, 2020, our Board of Directors authorized an additional $100.0 million. On each of July 28, 2020 and December 3, 2020, our Board of Directors authorized an additional $200.0 million. On December 1, 2022, our Board of Directors authorized an additional $400.0 million, increasing the Repurchase Program to an aggregate authorization of $1.3 billion. No time limit has been established for the completion of the Repurchase Program, and the Repurchase Program may be suspended, discontinued or replaced by the Board of Directors at any time without prior notice. As of September 30, 2023, we had $460.7 million available under the Repurchase Program to repurchase additional shares.
The following table details our stock repurchases under the Repurchase Program:
 Three Months Ended September 30,Nine Months Ended September 30,
 2023202220232022
Shares of common stock repurchased and retired— 128 112 149 
Average price paid per share$— $159.87 $158.70 $157.48 
Total cost$— $20,430 $17,797 $23,528 
As we repurchase our common shares, we reduce stated capital on our Condensed Consolidated Balance Sheets for the $0.01 of par value of the shares repurchased, with the excess purchase price over par value recorded as a reduction to additional paid-in capital. If additional paid-in capital is reduced to zero, we record the remainder of the excess purchase price over par value as a reduction of retained earnings.
Common stock outstanding was approximately 35.5 million shares and 34.0 million shares as of September 30, 2023 and December 31, 2022, respectively. Common stock outstanding includes unvested restricted stock awards, which are considered issued and outstanding under the terms of the restricted stock award agreements. The increase in common stock outstanding was primarily due to the issuance of a total of 1,460,740 shares of our common stock to holders in connection with the conversion of their 2023 Convertible Notes at maturity.