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Note 21 - Income Taxes - Taxable Characteristics of Distributions Paid (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends distributed, amount	$ 503,793	$ 471,850	$ 454,036
Dividends distributed, percent
Series H Preferred Stock [Member]
Ordinary income, amount
Ordinary income, percent
Capital gain, amount			$ 13,417
Capital gain, percent			100.00%
Dividends distributed, amount			$ 13,417
Dividends distributed, percent			100.00%
Series I Preferred Stock [Member]
Ordinary income, amount	$ 21,636	$ 16,320
Ordinary income, percent	96.00%	68.00%
Capital gain, amount	$ 902	$ 7,680	$ 24,000
Capital gain, percent	4.00%	32.00%	100.00%
Dividends distributed, amount	$ 22,538	$ 24,000	$ 24,000
Dividends distributed, percent	100.00%	100.00%	100.00%
Series J Preferred Stock [Member]
Ordinary income, amount	$ 11,880	$ 8,415
Ordinary income, percent	96.00%	68.00%
Capital gain, amount	$ 495	$ 3,960	$ 12,375
Capital gain, percent	4.00%	32.00%	100.00%
Dividends distributed, amount	$ 12,375	$ 12,375	$ 12,375
Dividends distributed, percent	100.00%	100.00%	100.00%
Series K Preferred Stock [Member]
Ordinary income, amount	$ 9,450	$ 6,694
Ordinary income, percent	96.00%	68.00%
Capital gain, amount	$ 394	$ 3,150	$ 9,844
Capital gain, percent	4.00%	32.00%	100.00%
Dividends distributed, amount	$ 9,844	$ 9,844	$ 9,844
Dividends distributed, percent	100.00%	100.00%	100.00%
Series L Preferred Stock [Member]
Ordinary income, amount	$ 1,814
Ordinary income, percent	96.00%
Capital gain, amount	$ 76
Capital gain, percent	4.00%
Dividends distributed, amount	$ 1,890
Dividends distributed, percent	100.00%
Common Stock 1 [Member]
Ordinary income, amount	$ 260,573	$ 263,892
Ordinary income, percent	57.00%	62.00%
Capital gain, amount	$ 9,143	$ 127,689	$ 394,400
Capital gain, percent	2.00%	30.00%	100.00%
Dividends distributed, amount	$ 457,146	$ 425,631	$ 394,400
Dividends distributed, percent	100.00%	100.00%	100.00%
Return of capital, amount	$ 187,430	$ 34,050
Return of capital, percent	41.00%	8.00%

X

- Definition

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+ References

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- Definition

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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