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Fair Value Measurements (Level 3 Rollforward) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2014
Lakeshore Mall [Member]
Mar. 31, 2014
Lakeshore Mall [Member]
Mar. 31, 2014
Lakeshore Mall [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2014
Chapel Hill Mall [Member]
Dec. 31, 2013
Chapel Hill Mall [Member]
Mar. 31, 2014
Chapel Hill Mall [Member]
Revenues [Member]
Mar. 31, 2014
Chapel Hill Mall [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                        
Fair value of long-lived assets $ 53,348   $ 53,348   $ 53,348     $ 13,780       $ 53,348
Concentration risk, percentage                     1.00%  
Long-lived Assets, Real Estate [Roll Forward]                        
Beginning carrying value                 52,790 66,062    
Capital expenditures                 10      
Depreciation expense                 (1,232)      
Loss on impairment of real estate (106) (21,038) (17,256) (21,038)   (106) (5,100)   (12,050)      
Ending carrying value                 $ 52,790 $ 66,062