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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, 2017 USD ($) entity | Dec. 31, 2016 USD ($) entity | Dec. 31, 2015 USD ($) entity
Related Party Transactions and Investments in Non-Consolidated Entities |  |  |
Number of REITs in which are included in the operations data | entity | 7 | 9 | 10
Number of Sponsored REITs the Company held an interest in at period end | entity | 6 | 7 | 9
Balance Sheet Data (unaudited): |  |  |
Real estate, net | $ 312,861 | $ 345,532 |
Other assets | 74,076 | 86,594 |
Total liabilities | (151,092) | (164,820) |
Shareholders' equity | 235,845 | 267,306 |
Operating Data (unaudited): |  |  |
Rental revenues | 53,249 | 54,257 | $ 57,777
Other revenues | 7 | 39 | 34
Operating and maintenance expenses | (27,495) | (29,186) | (31,693)
Depreciation and amortization | (18,395) | (18,274) | (21,149)
Interest expense | (8,281) | (8,481) | (9,920)
Gain (loss) on sale, less applicable income tax | (702) | 26,397 |
Net income (loss) | $ (1,617) | $ 24,752 | $ (4,951)

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