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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) - $ / shares | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Series I Preferred Stock [Member] |  |
Dividends Per Depositary Share (in dollars per share) | $ 1.125 | $ 1.125
Series J Preferred Stock [Member] |  |
Dividends Per Depositary Share (in dollars per share) | 1.0313 | 1.0313
Series K Preferred Stock [Member] |  |
Dividends Per Depositary Share (in dollars per share) | 1.0547 | 1.0547
Series I Preferred Stock Redeemed [Member] |  |
Dividends Per Depositary Share (in dollars per share) | 0.9625 |
Series L Preferred Stock [Member] |  |
Dividends Per Depositary Share (in dollars per share) | 0.1602 |
Dividends Per Common Share (in dollars per share) | $ 0.81 | $ 0.765

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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