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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% |

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