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Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]            
Net income $ 187,974 $ 127,101 $ 8,175 $ 76,388 $ 315,075 $ 84,563
Weighted-average number of common shares outstanding (for basic calculation) 28,134   27,911   28,130 27,851
Dilutive stock awards 367   422   412 477
Weighted-average number of common shares outstanding (for diluted calculation) 28,501   28,333   28,542 28,328
Basic earnings per share $ 6.68   $ 0.29   $ 11.20 $ 3.04
Diluted earnings per share $ 6.60   $ 0.29   $ 11.04 $ 2.99