Quarterly report pursuant to Section 13 or 15(d)

Developments of Consolidated Outlet Centers (Narrative) (Details)

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Developments of Consolidated Outlet Centers (Narrative) (Details)
ft² in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
ft²
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
ft²
Sep. 30, 2016
USD ($)
Oct. 31, 2017
ft²
Interest costs capitalized for development activities | $ $ 798 $ 574 $ 2,000 $ 1,700  
Lancaster [Member]          
Square Feet 123   123    
Subsequent Event [Member] | Fort Worth [Member]          
Square Feet         352