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Real Estate Owned (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |  |
Land | $ 1,833,156 | $ 1,790,281 |  |
Summary of carrying amounts for real estate owned (at cost) |  |  |  |
Land Improvements | 173,821 | 189,940 |  |
Investment Building and Building Improvements, and Furniture, Fixtures and Equipment | 7,046,622 | 6,225,406 |  |
Under development: |  |  |  |
Real estate under development (net of accumulated depreciation of $0 and $0, respectively) | 124,072 | 177,632 |  |
Sold or held for sale: |  |  |  |
Real estate owned | 9,190,276 | 8,383,259 |  |
Real Estates Owned Accumulated Depreciation | 2,646,874 | 2,434,772 |  |
Accumulated depreciation | (2,646,874) | (2,434,772) | $ (2,208,794) | $ (1,924,682)
Total real estate owned, net of accumulated depreciation | 6,543,402 | 5,948,487 |  |
Land |  |  |  |
Under development: |  |  |  |
Real estate under development (net of accumulated depreciation of $0 and $0, respectively) | 78,085 | 24,584 |  |
Sold or held for sale: |  |  |  |
Sold or held for sale | 9,963 | 0 |  |
Construction in progress |  |  |  |
Under development: |  |  |  |
Real estate under development (net of accumulated depreciation of $0 and $0, respectively) | 45,987 | 153,048 |  |
Building and improvements |  |  |  |
Sold or held for sale: |  |  |  |
Sold or held for sale | 2,642 | 0 |  |
United Dominion Reality L.P. |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Land | 833,300 | 1,008,014 |  |
Sold or held for sale: |  |  |  |
Real estate owned | 3,630,905 | 4,238,770 |  |
Accumulated depreciation | (1,281,258) | (1,403,303) | $ (1,241,574) | $ (1,097,133)
Total real estate owned, net of accumulated depreciation | $ 2,349,647 | $ 2,835,467 |  |

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