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Earnings Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share
(15)    Earnings per Share
    The following table shows the information used in the calculation of our basic and diluted earnings per share calculation as of December 31, 2020, 2019 and 2018. See Note 14 "Stockholders' Equity" for details on our April 12, 2018 stock split and our common stock repurchases in 2020 and 2019.
For the Year Ended December 31,
202020192018
Weighted average common shares outstanding for basic calculation267,916,483 289,057,356 297,748,327 
Add: Effect of equity awards14,161 17,245 5,443 
Weighted average common shares outstanding for diluted calculation267,930,644 289,074,601 297,753,770 
    Basic earnings per common share are calculated by dividing net income (loss) by the weighted average number of common shares outstanding, which includes 73,320, 32,981 and 5,592 shares of participating securities in 2020, 2019 and 2018, respectively. Diluted earnings per share are calculated by dividing net income (loss) by the sum of the weighted average number of common shares outstanding plus the additional common shares that would have been outstanding if potentially dilutive securities had been issued.
    The weighted average common shares outstanding for the diluted earnings per share calculation excludes consideration of 1,667,325, 1,082,113 and 650,432 equivalent shares in 2020, 2019 and 2018, respectively, as these shares are anti-dilutive.