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Shareholders' Equity
 9 Months Ended
Sep. 30, 2021
Shareholders’ Equity [Abstract]  
Shareholders' Equity 5. Shareholders’ Equity We have had a stock repurchase program in place since 2008. As of September 30, 2021, we had $209,792 authorized for repurchasing shares of our common stock, which includes the $100,000 additional authorization approved by our Board of Directors and announced on October 21, 2021. Shares we repurchased are being held in treasury stock until they are reissued or retired at the discretion of our Board of Directors. During the nine months ended September 30, 2021, 43 shares of common stock at a total cost of $63,492 were netted and surrendered as payment for minimum statutory withholding obligations in connection with the vesting of outstanding stock awards. Shares surrendered by the participants in accordance with the applicable award agreements and plan are deemed repurchased by us but are not part of publicly announced share repurchase programs.