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Related Party Transactions and Investments in Non-Consolidated Entities - Summarized financial information for Sponsored REITs (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) entity | Dec. 31, 2014 USD ($) entity | Dec. 31, 2013 USD ($) entity | Dec. 31, 2012 entity
Related Party Transactions and Investments in Non-Consolidated Entities |  |  |  |
Sponsored REITs (in entities) | entity | 9 | 10 | 14 | 15
Balance Sheet Data (unaudited): |  |  |  |
Real estate, net | $ 418,959 | $ 451,822 |  |
Other assets | 101,734 | 127,259 |  |
Total liabilities | (203,628) | (203,239) |  |
Shareholders' equity | 317,065 | 375,842 |  |
Operating Data (unaudited): |  |  |  |
Rental revenues | 57,777 | 66,457 | $ 93,608 |
Other revenues | 34 | 43 | 68 |
Operating and maintenance expenses | (31,693) | (34,318) | (48,718) |
Depreciation and amortization | (21,149) | (23,417) | (31,450) |
Interest expense | (9,920) | (9,627) | (13,752) |
Gain on sale, less applicable income tax |  |  | 5,851 |
Net loss | $ (4,951) | $ (862) | $ 5,607 |

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