Quarterly report pursuant to Section 13 or 15(d)

Real Estate Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details)

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Real Estate Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
sqft
item
Real Estate Properties [Line Items]  
Number of Buildings 2
Rentable Square Feet 220,242
Garage Parking Spaces 850
Development Costs Incurred by Company $ 122,591
14 Sylvan Way [Member]
  
Real Estate Properties [Line Items]  
Number of Buildings 1
Rentable Square Feet 203,506
Development Costs Incurred by Company 51,484 [1]
Development Costs Per Parking Space 253.00
Port Imperial South 4/5 [Member]
  
Real Estate Properties [Line Items]  
Number of Buildings 1
Rentable Square Feet 16,736
Garage Parking Spaces 850
Development Costs Incurred by Company 71,107 [2]
Land [Member] | 14 Sylvan Way [Member]
  
Real Estate Properties [Line Items]  
Development Costs Incurred by Company 13,000
Land [Member] | Port Imperial South 4/5 [Member]
  
Real Estate Properties [Line Items]  
Development Costs Incurred by Company 13,100
Leases [Member] | 14 Sylvan Way [Member]
  
Real Estate Properties [Line Items]  
Development Costs Incurred by Company $ 4,300
[1] Development costs included approximately $13.0 million in land costs and $4.3 million in leasing costs. Amounts are as of September 30, 2013.
[2] Development costs included approximately $13.1 million in land costs. Amounts are as of September 30, 2013.