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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net income $ 190,959 $ 80,244 $ 8,175 $ 76,388 $ 72,416 $ 98,582 $ 91,028 $ 88,132 $ 355,766 $ 350,158 $ 176,553
Weighted-average number of common shares outstanding (for basic calculation)                 27,917 27,740 27,823
Dilutive stock awards                 499 555 139
Weighted-average number of common shares outstanding (for diluted calculation)                 28,416 28,295 27,962
Basic earnings per share $ 6.82 $ 2.87 $ 0.29 $ 2.75 $ 2.61 $ 3.55 $ 3.28 $ 3.18 $ 12.74 $ 12.62 $ 6.35
Diluted earnings per share $ 6.69 $ 2.82 $ 0.29 $ 2.70 $ 2.55 $ 3.47 $ 3.22 $ 3.13 $ 12.52 $ 12.38 $ 6.31