Annual report pursuant to Section 13 and 15(d)

Real Estate Transactions (Impairments On Properties Held And Used) (Narrative) (Details)

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Real Estate Transactions (Impairments On Properties Held And Used) (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2013
property
Dec. 31, 2012
Real Estate Properties [Line Items]          
Number of impaired properties       18  
Mortgage loan $ 746,191,000   $ 757,495,000 $ 746,191,000 $ 757,495,000
Impairments 62,153,000 [1],[2] 48,700,000 [1] 9,845,000 [3] 110,853,000 9,845,000
Investment in property 3,728,945,000   3,901,222,000 3,728,945,000 3,901,222,000
Capitalization rate       8.50% 9.00%
Roseland, Parsippany, Warren And Lyndhurst, New Jersey [Member]
          
Real Estate Properties [Line Items]          
Number of impaired properties       9  
Area of property (in square feet) 1,300,000     1,300,000  
Mortgage loan 160,000,000     160,000,000  
New Jersey And New York [Member]
          
Real Estate Properties [Line Items]          
Number of impaired properties       7  
Area of property (in square feet) 646,000     646,000  
Morris Plains And Upper Saddle River, New Jersey [Member]
          
Real Estate Properties [Line Items]          
Number of impaired properties       2  
Area of property (in square feet) 550,000     550,000  
East Rutherford, New Jersey Property [Member]
          
Real Estate Properties [Line Items]          
Impairments         6,300,000
Investment in property     11,900,000   11,900,000
Estimated amount recoverable at sale     5,600,000   5,600,000
Newark, New Jersey [Member]
          
Real Estate Properties [Line Items]          
Impairments         500,000
Minimum [Member]
          
Real Estate Properties [Line Items]          
Discount rate       10.00% 10.00%
Maximum [Member]
          
Real Estate Properties [Line Items]          
Discount rate       15.00% 15.00%
9200 Edmonston Road [Member]
          
Real Estate Properties [Line Items]          
Area of property (in square feet)     38,690   38,690
Impairments         3,000,000
Mortgage loan, maturity date         May 1, 2013
Mortgage loans, carrying amount     $ 4,300,000   $ 4,300,000
[1] Amounts for the year ended December 31, 2013 relate to impairment charges as further described in Note 3: Real Estate Transactions - Impairments on Properties Held and Used.
[2] During the quarter ended December 31, 2013, the Company identified and recorded an out-of-period adjustment to reflect a charge of $1,260,000 to correct an error in the measurement of its impairment charges on certain properties in the third quarter of 2013. In the third quarter, in measuring the impairments on these properties, the Company did not include certain tenant improvement amounts to be paid for in-place leases in its discounted cash flows used to measure fair value and, as a result, should have recognized larger impairment charges by this aggregate amount. The Company has determined that this adjustment was not material to the quarter ended December 31, 2013 or the prior interim period.
[3] Amounts for the year ended December 31, 2012 relate to impairment charges as further described in Note 3: Real Estate Transactions - Impairments on Properties Held and Used.