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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, 2021 | Mar. 31, 2020
Earnings Per Share, Basic and Diluted [Line Items] |  |
Net income available to common stockholders - numerator for earnings per common share | $ 271,765 | $ 236,336
Weighted average common shares outstanding (shares) | 95,734,851 | 91,644,315
Denominator for earnings per common share - assuming dilution (shares) | 96,215,665 | 92,021,079
Earnings per common share | $ 2.84 | $ 2.58
Earnings per common share - assuming dilution | $ 2.82 | $ 2.57
Stock Options and Deferred Compensation Agreements |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |
Effect of dilutive securities: share-based payment arrangements (shares) | 181,054 | 137,289
Restricted Stock and Restricted Stock Units |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |
Effect of dilutive securities: share-based payment arrangements (shares) | 299,760 | 239,475
Stock Options |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |
Antidilutive securities excluded from computation of diluted earnings per common share, amount (shares) | 100,000 | 50,000
Antidilutive securities excluded from computation of diluted earnings per common share, exercise price | $ 30.50 | $ 26.70

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