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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, 2018 USD ($) entity | Dec. 31, 2017 USD ($) entity | Dec. 31, 2016 USD ($) entity
Related Party Transactions and Investments in Non-Consolidated Entities |  |  |
Number of REITs in which are included in the operations data | entity | 6 | 7 | 9
Number of Sponsored REITs the Company held an interest in at period end | entity | 3 | 6 | 7
Balance Sheet Data (unaudited): |  |  |
Real estate, net | $ 97,034 | $ 312,861 |
Other assets | 18,532 | 74,076 |
Total liabilities | (75,382) | (151,092) |
Shareholders' equity | 40,184 | 235,845 |
Operating Data (unaudited): |  |  |
Rental revenues | 40,382 | 53,249 | $ 54,257
Other revenues | 1 | 7 | 39
Operating and maintenance expenses | (20,584) | (27,495) | (29,186)
Depreciation and amortization | (13,077) | (18,395) | (18,274)
Interest expense | (6,869) | (8,281) | (8,481)
Gain (loss) on sale | 17,095 | (702) | 26,397
Net income (loss) | $ 16,948 | $ (1,617) | $ 24,752

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