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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								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share, Basic and Diluted [Line Items]
Net income available to common stockholders - numerator for earnings per common share	$ (6,262)	$ 661,250	$ (253,379)	$ 236,336	$ 220,150	$ 37,360	$ 18,590	$ (30,010)	$ 637,945	$ 246,090	$ 458,016
Weighted average common shares outstanding (shares)									92,055,035	91,139,453	90,347,915
Denominator for earnings per common share - assuming dilution (shares)									92,392,496	91,782,242	91,422,585
Earnings per common share	$ (0.07)	$ 7.20	$ (2.76)	$ 2.58	$ 2.41	$ 0.41	$ 0.20	$ (0.33)	$ 6.93	$ 2.70	$ 5.07
Earnings per common share - assuming dilution	$ (0.07)	$ 7.17	$ (2.76)	$ 2.57	$ 2.40	$ 0.41	$ 0.20	$ (0.33)	$ 6.90	$ 2.68	$ 5.01
Stock Options And Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)									93,014	304,196	709,433
Restricted Stock And Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)									244,447	338,593	365,237
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