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Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions - Preferred Stock Issued (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Proceeds, After Expenses |  | $ 286,421 | $ 493
Series L Preferred Stock [Member] |  |  |
Depositary Shares Issued (in shares) | 9,000,000 |  |
Net Proceeds, After Expenses | $ 218,100 |  |
Offering/ Redemption Price (in dollars per share) | $ 25 |  |
Series M Preferred Stock [Member] |  |  |
Depositary Shares Issued (in shares) | 9,200,000 |  |
Net Proceeds, After Expenses | $ 222,800 |  |
Offering/ Redemption Price (in dollars per share) | $ 25 |  |

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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
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