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Note 6 - Other Real Estate Investments and Other Assets (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Equity Method Investments | $ 568,698 |  | $ 568,698 |  | $ 483,861
Income (Loss) from Equity Method Investments, Total | $ 19,000 | $ 13,200 | $ 35,953 | $ 27,902 |
Preferred Equity Investments [Member] |  |  |  |  |
Number of Real Estate Properties | 286 |  | 286 |  |
Income (Loss) from Equity Method Investments, Total |  |  | $ 19,500 |  |
Equity Method Investment, Realized Gain (Loss) on Disposal, Total |  |  | $ 10,000 |  |
Preferred Equity Investments [Member] | Leased Properties [Member] |  |  |  |  |
Number of Real Estate Properties | 273 |  | 273 |  |
Preferred Equity Investments [Member] | Maximum Exposure [Member] |  |  |  |  |
Equity Method Investments | $ 172,100 |  | $ 172,100 |  |
Albertstons Companies, Inc. [Member] |  |  |  |  |
Percentage of Ownership | 9.74% |  | 9.74% |  |
Albertstons Companies, Inc. [Member] | Other Assets [Member] |  |  |  |  |
Other Investments, Total | $ 140,200 |  | $ 140,200 |  |

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