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Investments in Real Estate Entities (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Combined summary of the operating results of the accounted for using the equity method |  |  |
Rental and other income | $ 131,901 | $ 173,578 | $ 198,939
Operating and other expenses | (50,945) | (67,962) | (80,301)
Gain on sale of communities | 196,749 | 98,899 | 333,221
Interest expense, net | (45,886) | (45,517) | (61,458)
Depreciation expense | (34,471) | (45,324) | (52,116)
Net income | 197,348 | 113,674 | 338,285
Schedule of Equity Method Investments [Line Items] |  |  |
Gain (Loss) on Extinguishment of Debt | (7,075) | 26,736 | (412)
Funds [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Gain (Loss) on Extinguishment of Debt | $ 12,659 | $ 4,481 | $ 10,528

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