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Earnings Per Share
 6 Months Ended
Jun. 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 Six months ended June 30, June 30, 2021 2020 2021 2020Net income$ 187,974 $ 8,175 $ 315,075 $ 84,563Shares: Weighted-average number of common shares outstanding (for basic calculation) 28,134 27,911 28,130 27,851Dilutive stock awards 367 422 412 477Weighted-average number of common shares outstanding (for diluted calculation) 28,501 28,333 28,542 28,328Basic earnings per share$ 6.68 $ 0.29 $ 11.20 $ 3.04Diluted earnings per share$ 6.60 $ 0.29 $ 11.04 $ 2.99  The following stock awards were excluded from the calculation of diluted earnings per share: Three months ended Six months ended June 30, June 30, 2021 2020 2021 2020Stock awards subject to performance conditions 76 100 73 95Stock awards that were antidilutive 76 117 62 110Total stock awards excluded from diluted earnings per share 152 217 135 205