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Fair Value Measurements (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
derivative_instrument
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
derivative_instrument
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
derivative_instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain (Loss) on Investments $ 0 $ 0 $ 16,560 $ 0  
Net proceeds from sales of available-for-sale securities     20,755 0  
Long-term debt, fair value 5,020,685   5,020,685   $ 4,947,026
Mortgage and other indebtedness 4,834,205   4,834,205   4,700,460
Loss on impairment 2,781 $ 106 2,781 $ 17,256  
Carrying value of real estate assets $ 2,718   $ 2,718   $ 0
Interest Rate Swap          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of Instruments | derivative_instrument 4   4   4
Common Stock          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Available-for-sale Securities, Amortized Cost Basis $ 4,195   $ 4,195   $ 4,195
Madison Square          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loss on impairment 2,620        
Fair value of real estate investments 5,000   5,000    
Burlington          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loss on impairment     161    
Net proceeds from sale of real estate     750    
Carrying value of real estate assets $ 911   $ 911