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Acquisitions, Dispositions, Impairment, and Discontinued Operations (Fair value of assets acquired and liabilities assumed) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Land | $ 967,375 | $ 989,247
Buildings and Improvements | 5,967,023 | 5,911,432
Real estate assets, at cost, total | 6,934,398 | 6,900,679
Accumulated depreciation | (1,890,656) | (1,780,694)
Net operating real estate assets | 5,043,742 | 5,119,985
Properties under development, including land | 442,292 | 486,918
Total assets held for sale | $ 0 | 239,063
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Land |  | 59,438
Buildings and Improvements |  | 373,419
Real estate assets, at cost, total |  | 432,857
Accumulated depreciation |  | (197,996)
Net operating real estate assets |  | 234,861
Properties under development, including land |  | 4,202
Discontinued operations held for sale, including land |  | 239,063
Other assets related to properties held for sale |  | 1,191
Total assets held for sale |  | 240,254
Liabilities related to assets held for sale |  | $ 1,654

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