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Investments in Real Estate Partnerships - Income Statment Summarized Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Revenues and expenses for the investments in real estate partnerships on a combined basis |  |  |
Total revenues | $ 414,631 | $ 396,596 | $ 364,087
Operating expenses: |  |  |
Depreciation and amortization | 99,847 | 99,327 | 99,252
Operating and maintenance | 66,299 | 58,283 | 52,725
General and administrative | 5,697 | 5,582 | 5,342
Real estate taxes | 54,119 | 49,904 | 42,813
Other expenses | 1,003 | 2,923 | 2,356
Total operating expenses | 226,965 | 216,019 | 202,488
Other expense (income): |  |  |
Interest expense, net | 73,508 | 73,244 | 69,193
Equity Method Investment, Summarized Financial Information, Gain Loss on Sale of Real Estate | 16,624 | 34,276 | 70,907
Loss (gain) on extinguishment of debt | 0 | 0 | 69
Other expense (income) | 1,697 | 1,651 | 2,197
Total other expense | 58,581 | 40,619 | 552
Net income (loss) | 129,085 | 139,958 | 161,047
Unconsolidated Properties [Member] |  |  |
Other expense (income): |  |  |
Income (Loss) from Equity Method Investments | $ 16,624 | $ 34,276 | $ 70,907

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