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Note 22 - Income Taxes - Taxable Characteristics of Distributions Paid (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends distributed, amount	$ 377,651	$ 528,606	$ 526,912
Series I Preferred Stock [Member]
Ordinary income, amount	$ 0	$ 7,389	$ 5,565
Ordinary income, percent	0.00%	77.00%	53.00%
Capital gain, amount	$ 0	$ 2,207	$ 4,935
Capital gain, percent	0.00%	23.00%	47.00%
Dividends distributed, amount	$ 0	$ 9,596	$ 10,500
Dividends distributed, percent	0.00%	100.00%	100.00%
Series J Preferred Stock [Member]
Ordinary income, amount	$ 0	$ 11,541	$ 6,559
Ordinary income, percent	0.00%	77.00%	53.00%
Capital gain, amount	$ 0	$ 3,447	$ 5,816
Capital gain, percent	0.00%	23.00%	47.00%
Dividends distributed, amount	$ 0	$ 14,988	$ 12,375
Dividends distributed, percent	0.00%	100.00%	100.00%
Series K Preferred Stock [Member]
Ordinary income, amount	$ 0	$ 6,927	$ 5,217
Ordinary income, percent	0.00%	77.00%	53.00%
Capital gain, amount	$ 0	$ 2,069	$ 4,627
Capital gain, percent	0.00%	23.00%	47.00%
Dividends distributed, amount	$ 0	$ 8,996	$ 9,844
Dividends distributed, percent	0.00%	100.00%	100.00%
Series L Preferred Stock [Member]
Ordinary income, amount	$ 4,382	$ 8,879	$ 6,111
Ordinary income, percent	38.00%	77.00%	53.00%
Capital gain, amount	$ 7,149	$ 2,652	$ 5,420
Capital gain, percent	62.00%	23.00%	47.00%
Dividends distributed, amount	$ 11,531	$ 11,531	$ 11,531
Dividends distributed, percent	100.00%	100.00%	100.00%
Series M Preferred Stock [Member]
Ordinary income, amount	$ 5,277	$ 10,692	$ 6,031
Ordinary income, percent	38.00%	77.00%	53.00%
Capital gain, amount	$ 8,609	$ 3,194	$ 5,348
Capital gain, percent	62.00%	23.00%	47.00%
Dividends distributed, amount	$ 13,886	$ 13,886	$ 11,379
Dividends distributed, percent	100.00%	100.00%	100.00%
Common Stock 1 [Member]
Ordinary income, amount	$ 133,849	$ 328,726	$ 235,642
Ordinary income, percent	38.00%	70.00%	50.00%
Capital gain, amount	$ 214,863	$ 98,618	$ 212,077
Capital gain, percent	61.00%	21.00%	45.00%
Dividends distributed, amount	$ 352,234	$ 469,609	$ 471,283
Dividends distributed, percent	100.00%	100.00%	100.00%
Return of capital, amount	$ 3,522	$ 42,265	$ 23,564
Return of capital, percent	1.00%	9.00%	5.00%

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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