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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
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Dec. 31, 2016 USD ($) entity | Dec. 31, 2015 USD ($) entity | Dec. 31, 2014 USD ($) entity
Related Party Transactions and Investments in Non-Consolidated Entities |  |  |
Number of REITs in which are included in the operations data | entity | 9 | 10 | 14
Number of Sponsored REITs the Company held an interest in at period end | entity | 7 | 9 | 10
Balance Sheet Data (unaudited): |  |  |
Real estate, net | $ 345,532 | $ 418,959 |
Other assets | 86,594 | 101,734 |
Total liabilities | (164,820) | (203,628) |
Shareholders' equity | 267,306 | 317,065 |
Operating Data (unaudited): |  |  |
Rental revenues | 54,257 | 57,777 | $ 66,457
Other revenues | 39 | 34 | 43
Operating and maintenance expenses | (29,186) | (31,693) | (34,318)
Depreciation and amortization | (18,274) | (21,149) | (23,417)
Interest expense | (8,481) | (9,920) | (9,627)
Gain on sale, less applicable income tax | 26,397 |  |
Net income (loss) | $ 24,752 | $ (4,951) | $ (862)

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