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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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share, Basic and Diluted [Line Items]
Net income available to common stockholders - numerator for earnings per common share	$ 430,317	$ 637,945	$ 246,090
Weighted average common shares outstanding (shares)	93,860,378	92,055,035	91,139,453
Denominator for earnings per common share - assuming dilution (shares)	94,491,159	92,392,496	91,782,242
Earnings per common share	$ 4.58	$ 6.93	$ 2.70
Earnings per common share - assuming dilution	$ 4.55	$ 6.90	$ 2.68
Stock Options And Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)	271,422	93,014	304,196
Restricted Stock And Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)	359,359	244,447	338,593
Stock Options
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive securities excluded from computation of diluted earnings per common share, amount (shares)	0	0	0

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