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Investments in Real Estate Partnerships - Income Statment Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues and expenses for the investments in real estate partnerships on a combined basis |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 258,460 | $ 242,944 | $ 231,113 | $ 283,658 | $ 288,733 | $ 282,276 | $ 275,872 | $ 286,257 | $ 1,016,175 | $ 1,133,138 | $ 1,120,975
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 101,590 | 97,844 | 99,847
Operating and maintenance |  |  |  |  |  |  |  |  | 65,146 | 65,811 | 66,299
General and administrative |  |  |  |  |  |  |  |  | 5,870 | 6,201 | 5,697
Real estate taxes |  |  |  |  |  |  |  |  | 53,747 | 53,410 | 54,119
Other operating expenses |  |  |  |  |  |  |  |  | 3,126 | 2,709 | 2,700
Total operating expenses |  |  |  |  |  |  |  |  | 229,479 | 225,975 | 228,662
Other expense (income): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | 66,786 | 75,449 | 73,508
Equity Method Investment, Summarized Financial Information, Gain Loss on Sale of Real Estate |  |  |  |  |  |  |  |  | (7,146) | (64,798) | (16,624)
Early extinguishment of debt |  |  |  |  |  |  |  |  | 554 | 0 | 0
Provision for impairment, net of tax |  |  |  |  |  |  |  |  | 0 | 9,223 | 0
Total other expense (income) |  |  |  |  |  |  |  |  | 60,194 | 19,874 | 56,884
Net income |  |  |  |  |  |  |  |  | 47,317 | 243,258 | 252,325
Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues and expenses for the investments in real estate partnerships on a combined basis |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 381,094 | 417,053 | 414,631
Net Income [Member] |  |  |  |  |  |  |  |  |  |  |
Other expense (income): |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 91,421 | 171,204 | 129,085
Unconsolidated Properties [Member] |  |  |  |  |  |  |  |  |  |  |
Other expense (income): |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | $ 34,169 | $ 60,956 | $ 42,974

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