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Investments in Real Estate Partnerships - Income Statment Summarized Financial Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) property
Schedule of Equity Method Investments [Line Items] |  |  |
Document Fiscal Year Focus | 2016 |  |
Revenues and expenses for the investments in real estate partnerships on a combined basis |  |  |
Total revenues | $ 364,087 | $ 363,745 | $ 361,103
Operating expenses: |  |  |
Depreciation and amortization | 99,252 | 111,648 | 117,780
Operating and maintenance | 52,725 | 51,970 | 55,216
General and administrative | 5,342 | 5,292 | 5,503
Real estate taxes | 42,813 | 43,769 | 42,380
Other expenses | 2,356 | 2,989 | 2,234
Total operating expenses | 202,488 | 215,668 | 223,113
Other expense (income): |  |  |
Interest expense, net | 69,193 | 79,477 | 84,155
Equity Method Investment, Summarized Financial Information, Gain Loss on Sale of Real Estate | 70,907 | 2,766 | 28,856
Loss (gain) on extinguishment of debt | 69 | 0 | 114
Provision for impairment | 0 | 9,102 | 2,123
Other expense (income) | 2,197 | 1,516 | 988
Total other expense | 552 | 87,329 | 58,524
Net income (loss) | 161,047 | 60,748 | 79,466
Unconsolidated Properties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from sale of real estate investments | 174,090 | 39,459 | 88,106
Other expense (income): |  |  |
Income (Loss) from Equity Method Investments | 70,907 | 2,766 | 28,856
Equity Method Investment, Amount Sold | $ 25,003 | $ 1,108 | $ 13,615
Operating Segments [Member] |  |  |
Other expense (income): |  |  |
Number of Real Estate Properties Sold | property | 11 | 5 | 11
Operating Segments [Member] | Unconsolidated Properties [Member] |  |  |
Other expense (income): |  |  |
Number of Real Estate Properties Sold | property | 10 | 2 | 6
Land [Member] |  |  |
Other expense (income): |  |  |
Number of Real Estate Properties Sold | property | 16 | 2 | 6
Land [Member] | Unconsolidated Properties [Member] |  |  |
Other expense (income): |  |  |
Number of Real Estate Properties Sold | property | 1 | 0 | 2

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