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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Earnings Per Common Share [Abstract] |  |
Net income (loss) | $ 341,862,000 | $ 16,612,000
Less: dividends declared-common shares and nonvested common shares | (62,229,000) | (63,277,000)
Undistributed earnings | $ 279,633,000 | $ (46,666,000)
Percentage allocated to common shareholders | 98.70% | 98.70%
Net income (loss) available to common stockholders, total | $ 276,031,000 | $ (46,082,000)
Add: dividends declared-common shareholders | 61,415,000 | 62,488,000
Numerator for basic and diluted earnings per common share | $ 337,446,000 | $ 16,406,000
Denominator for basic earnings per weighted-average common shares | 39,543,000 | 40,204,000
Effect of dilutive securities: Options | 54,000 | 92,000
Denominator for diluted earnings per adjusted weighted-average common shares | 39,597,000 | 40,296,000
Per common share net income (loss) |  |
Basic | $ 8.53 | $ 0.41
Diluted | $ 8.52 | $ 0.41
Basic weighted-average common shares outstanding | 39,543,000 | 40,204,000
Basic weighted-average common shares outstanding and nonvested common shares expected to vest | 40,059,000 | 40,713,000

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration