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Acquisitions, Dispositions, Discontinued Operations and Assets Held for Sale Acquisitions, Dispositions, Discontinued Operations and Assets Held for Sale (Assets and Liabilities Held for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Long Lived Assets Held-for-sale [Line Items] |  |
Land | $ 998,519 | $ 989,247
Buildings and improvements | 5,978,843 | 5,911,432
Real estate assets, at cost, total | 6,977,362 | 6,900,679
Accumulated depreciation | (1,841,107) | (1,780,694)
Net operating real estate assets | 5,136,255 | 5,119,985
Properties under development, including land | 489,730 | 486,918
Properties held for sale, including land | 238,417 | 239,063
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Land | 59,438 | 59,438
Buildings and improvements | 377,100 | 373,419
Real estate assets, at cost, total | 436,538 | 432,857
Accumulated depreciation | (202,323) | (197,996)
Net operating real estate assets | 234,215 | 234,861
Properties under development, including land | 4,202 | 4,202
Properties held for sale, including land | 238,417 | 239,063
Other assets related to properties held for sale, including land | 1,139 | 1,191
Total assets held for sale | 239,556 | 240,254
Liabilities related to assets held for sale | $ 1,371 | $ 1,654

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