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Shareholders' Equity
 12 Months Ended
Dec. 31, 2020
Shareholders’ Equity [Abstract]  
Shareholders' Equity 7. Shareholders’ Equity

We have had a stock repurchase program in place since 2008. Through December 31, 2020, we had announced authorizations by our Board of Directors to repurchases shares of common stock which, in the aggregate, authorized expenditures of up to $2,800,000. As of December 31, 2020, $115,018 was available to be repurchased under announced repurchase authorizations. Shares repurchased are being held in treasury stock until they are reissued or retired at the discretion of the Board of Directors. On March 20, 2020, we temporarily suspended our share buyback program in the midst of the COVID-19 pandemic.

During the years ended December 31, 2020, 2019, and 2018, shares of common stock at a total cost of $48,555, $10,420, and $5,411, respectively, 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.