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Earnings Per Share
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share 9. Earnings Per Share The following table sets forth the computations of basic and diluted earnings per share: Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020Net income$ 204,434 $ 80,244 $ 519,509 $ 164,807Shares: Weighted-average number of common shares outstanding (for basic calculation) 28,150 27,973 28,137 27,892Dilutive stock awards 325 481 383 478Weighted-average number of common shares outstanding (for diluted calculation) 28,475 28,454 28,520 28,370Basic earnings per share$ 7.26 $ 2.87 $ 18.46 $ 5.91Diluted earnings per share$ 7.18 $ 2.82 $ 18.22 $ 5.81 The following stock awards were excluded from the calculation of diluted earnings per share: Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020Stock awards subject to performance conditions 75 100 74 97Stock awards that were antidilutive 3 2 42 74Total stock awards excluded from diluted earnings per share 78 102 116 171