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Fair Value Measurements (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2016
USD ($)
derivative_instrument
Mar. 31, 2016
USD ($)
mall
derivative_instrument
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
derivative_instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, fair value $ 4,980,818 $ 4,980,818     $ 4,945,622
Mortgage and other indebtedness, net 4,683,487 $ 4,683,487     $ 4,710,628
Holding period (up to) (in years)   10 years      
Loss on impairment   $ 19,685   $ 0  
Fair value of real estate investments $ 57,200 57,200      
Outparcel Sale          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loss on impairment   $ 171      
River Ridge Mall          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Percentage of equity interest in real estate property 25.00% 25.00%      
Bonita Lakes, Midland Mall and Ridge River Mall          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loss on impairment   $ 19,514 $ 19,514    
Number of malls with impairment | mall   3      
Bonita Lakes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net proceeds from sale of real estate   $ 5,323      
Fair value of real estate investments $ 28,000 28,000      
Midland Mall          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loss on impairment   4,681      
Fair value of real estate investments 29,200 29,200      
River Ridge Mall          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of real estate investments 20,033 $ 20,033      
Reserve for capital expenditures $ 2,100        
Minimum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Capitalization rate (as a percent)   9.00%      
Maximum          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Capitalization rate (as a percent)   12.00%      
Interest Rate Swap          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of Instruments | derivative_instrument 4 4     4