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Dispositions and Assets Held for Sale (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Property
shopping_center
Sep. 30, 2016
USD ($)
Property
shopping_center
Sep. 30, 2017
USD ($)
building
Property
shopping_center
Sep. 30, 2016
USD ($)
building
Property
shopping_center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on disposition of operating properties     $ 54,920 $ 10,232
Impairment charge $ 11,065   27,383 1,971
Proceeds from sale of unconsolidated joint venture interest     12,369 0
Gain on disposition of unconsolidated joint venture interest 4,556 $ 0 4,556 0
Real estate held-for-sale $ 8,200 $ 24,100 $ 8,200 $ 24,100
Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of shopping centers sold | shopping_center 8 2 14 4
Proceeds from sale $ 121,400 $ 10,600 $ 228,700 $ 31,100
Gain on disposition of operating properties 25,900 $ 2,500 54,900 10,200
Impairment charge $ 400   $ 400 $ 100
Number of outparcel building sold | building     2 1
Held-for-sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of real estate properties | Property 1 2 1 2
Impairment of real estate       $ 2,000