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Investment in Consolidated and Unconsolidated Entities - Combined Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Liabilities and equity: |  |  |
Carrying value of investments in unconsolidated entities | $ 180,764 | $ 178,728 |
Statements of Operations: |  |  |
Revenues | 62,367 | 70,385 | $ 67,033
Expenses |  |  |
Interest expense and loan cost amortization | 13,419 | 13,015 | 15,319
Depreciation and amortization | 26,860 | 27,209 | 23,252
Operating expenses, ground rent and general and administrative expenses | 22,304 | 21,671 | 21,200
Impairments | 4,745 | 0 | 0
Total expenses | 67,328 | 61,895 | 59,771
Net income before gain on sale of real estate | (4,961) | 8,490 | 7,262
Gain on sale of real estate | 434 | 0 | 35,462
Net income | (4,527) | 8,490 | 42,724
Company's share of: |  |  |
Company's share of net income, net of excess basis depreciation of $520, $520, and $520, respectively | (1,930) | 4,109 | 17,307
Distributions from unconsolidated entities in excess of the investments' carrying value | 1,126 | 5,190 | 17,771
Equity in (losses) earnings of unconsolidated entities | (804) | 9,299 | 35,078
Unconsolidated Entities [Member] |  |  |
Assets |  |  |
Real estate assets, net of accumulated depreciation | 586,671 | 628,667 |
Other assets | 73,423 | 71,288 |
Total assets | 660,094 | 699,955 |
Liabilities and equity: |  |  |
Equity Method Investments Long Term Debt, Net | 311,574 | 311,378 |
Other liabilities | 49,032 | 65,225 |
Equity | 299,488 | 323,352 |
Total liabilities and equity | 660,094 | 699,955 |
Company’s share of equity | 193,572 | 192,124 |
Net excess of the net book value of underlying assets over the cost of investments (net of accumulated amortization of $2,647 and $2,229, respectively) | (12,808) | (13,396) |
Carrying value of investments in unconsolidated entities | 180,764 | 178,728 |
Accumulated depreciation | 2,647 | 2,229 |
Company's share of: |  |  |
Excess basis depreciation | $ 520 | $ 520 | $ 520

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