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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