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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Common Share [Abstract] |  |  |  |
Net income (loss) | $ 679,982,000 | $ 190,880,000 | $ 1,021,844,000 | $ 207,492,000
Less: dividends declared-common shares and nonvested common shares | (62,045,000) | (61,927,000) | (124,274,000) | (125,205,000)
Undistributed earnings | $ 617,937,000 | $ 128,953,000 | $ 897,570,000 | $ 82,287,000
Percentage allocated to common shareholders | 98.60% | 98.70% | 98.70% | 98.70%
Net income (loss) available to common stockholders, total | $ 609,411,000 | $ 127,233,000 | $ 885,595,000 | $ 81,224,000
Add: dividends declared-common shareholders | 61,245,000 | 61,148,000 | 122,659,000 | 123,637,000
Numerator for basic and diluted earnings per common share | $ 670,656,000 | $ 188,381,000 | $ 1,008,254,000 | $ 204,861,000
Denominator for basic earnings per weighted-average common shares | 39,527,000 | 39,449,000 | 39,535,000 | 39,827,000
Effect of dilutive securities: Options | 41,000 | 69,000 | 48,000 | 81,000
Denominator for diluted earnings per adjusted weighted-average common shares | 39,567,000 | 39,519,000 | 39,582,000 | 39,908,000
Per common share net income (loss) |  |  |  |
Basic | $ 16.97 | $ 4.78 | $ 25.50 | $ 5.14
Diluted | $ 16.95 | $ 4.77 | $ 25.47 | $ 5.13
Basic weighted-average common shares outstanding | 39,527,000 | 39,449,000 | 39,535,000 | 39,827,000
Basic weighted-average common shares outstanding and nonvested common shares expected to vest | 40,080,000 | 39,983,000 | 40,069,000 | 40,348,000

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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2646-109256 + Details
Name: | us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration