Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Impairments On Properties Held and Used) (Narrative) (Details)

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Recent Transactions (Impairments On Properties Held and Used) (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
ft²
property
Sep. 30, 2015
USD ($)
ft²
property
Sep. 30, 2013
USD ($)
Dec. 31, 2014
USD ($)
property
Real Estate Properties [Line Items]        
Impairment charge $ 164,176 $ 164,176    
Mortgage loan 740,024 740,024   $ 820,910
Number of properties sold | property       16
Non-core Properties [Member]        
Real Estate Properties [Line Items]        
Impairment charge   158,600    
Aggregate carrying value 554,300 $ 554,300    
Number of impaired properties | property   22    
Estimated fair value 395,700 $ 395,700    
New Jersey [Member]        
Real Estate Properties [Line Items]        
Mortgage loan $ 65,000 $ 65,000    
Number of real estate properties | property 4 4    
Roseland And Parsippany Properties [Member]        
Real Estate Properties [Line Items]        
Impairment charge   $ 5,600 $ 12,500  
Number of impaired properties | property   3    
Area Of Real Estate Property | ft² 479,877 479,877    
New Jersey Hudson River [Member]        
Real Estate Properties [Line Items]        
Earn out period   3 years