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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
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
Stock Awards Excluded From The Calculation Of Diluted EPS 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