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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
	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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