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, 2023	Dec. 31, 2022		Dec. 31, 2021
Earnings Per Share, Basic and Diluted [Line Items]
Net income available to common stockholders - numerator for earnings per common share	$ 166,855	$ 1,876,544	[1]	$ 509,348	[1]
Weighted average common shares outstanding (shares)	79,476,080	90,558,121	[1]	93,860,378	[1]
Denominator for earnings per common share - assuming dilution (shares)	80,952,270	91,538,128	[1]	94,491,159	[1]
Earnings per common share	$ 2.10	$ 20.72	[1]	$ 5.43	[1]
Earnings per common share - assuming dilution	$ 2.06	$ 20.50	[1]	$ 5.39	[1]
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
Stock Options And Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)	546,204	523,248		271,422
Restricted Stock And Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)	929,986	456,759		359,359

[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.