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Earnings Per Common Share and Stockholders' Equity (Schedule of Earnings Per Common Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Earnings Per Share, Basic and Diluted [Line Items] |  |
Net income available to common stockholders - numerator for earnings per common share | $ 555,304 | $ 271,765
Weighted average common shares outstanding (shares) | 96,866,125 | 95,734,851
Denominator for earnings per common share - assuming dilution | 97,953,313 | 96,215,665
Earnings per common share | $ 5.73 | $ 2.84
Earnings per common share - assuming dilution | $ 5.67 | $ 2.82
Stock Options and Deferred Compensation Agreements |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |
Effect of dilutive securities: share-based payment arrangements (shares) | 612,265 | 181,054
Restricted Stock and Restricted Stock Units |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |
Effect of dilutive securities: share-based payment arrangements (shares) | 474,923 | 299,760
Stock Options |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |
Antidilutive securities excluded from computation of diluted earnings per common share, amount (shares) | 0 | 100,000
Antidilutive securities excluded from computation of diluted earnings per common share, exercise price |  | $ 30.50

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