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Disposed Properties Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Property
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Property
Properties
Jun. 30, 2016
USD ($)
Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gross disposition price       $ 1,728,600
Proceeds from sale of investment properties, net     $ 56,924 1,389,845
Gain on sale of investment properties $ 13,360 $ 52,385 $ 14,381 76,411
Number of surrendered properties | Property     1,000  
Gain on extinguishment of debt $ 882 (4,723) $ 882 (5,672)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax   $ 225,286   $ 225,286
Retail [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of disposed assets | Properties     3 18
Gross disposition price     $ 99,330  
Assets Surrendered [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of surrendered properties | Property 1      
Non-core [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of disposed assets | Properties       1