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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) - $ / shares | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Series I Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | $ 0.75 | $ 0.75
Series J Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | 0.6875 | 0.6875
Series K Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | 0.70312 | 0.70312
Series L Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | 0.64062 |
Series M Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | 0.65626 |
Dividends per common share (in dollars per share) | $ 0.56 | $ 0.54

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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