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Note 6 - Other Real Estate Investments and Other Assets (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Equity Method Investments | $ 580,737 |  | $ 580,737 |  | $ 483,861
Income (Loss) from Equity Method Investments, Total | $ 16,500 | $ 9,100 | $ 52,486 | $ 37,044 |
Preferred Equity Investments [Member] |  |  |  |  |
Number of Real Estate Properties | 285 |  | 285 |  |
Income (Loss) from Equity Method Investments, Total |  |  | $ 24,400 |  |
Equity Method Investment, Realized Gain (Loss) on Disposal, Total |  |  | $ 10,500 |  |
Preferred Equity Investments [Member] | Leased Properties [Member] |  |  |  |  |
Number of Real Estate Properties | 273 |  | 273 |  |
Preferred Equity Investments [Member] | Maximum Exposure [Member] |  |  |  |  |
Equity Method Investments | $ 175,200 |  | $ 175,200 |  |
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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