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Commitments And Contingencies (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
Harborside Plaza 4-A Agreement [Member]
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Sep. 30, 2011
Harborside Plaza 4-A Agreement [Member]
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Sep. 30, 2012
Harborside Plaza 4-A Agreement [Member]
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Sep. 30, 2011
Harborside Plaza 4-A Agreement [Member]
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Sep. 30, 2012
Harborside Plaza 5 Agreement [Member]
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Sep. 30, 2011
Harborside Plaza 5 Agreement [Member]
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Sep. 30, 2012
Harborside Plaza 5 Agreement [Member]
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Sep. 30, 2011
Harborside Plaza 5 Agreement [Member]
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Sep. 30, 2012
Property Lock-Ups [Member]
property
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Sep. 30, 2012
Property Lock-Ups Expired [Member]
property
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Dec. 31, 2011
Harborside Residential Project [Member]
item
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Sep. 30, 2012
Harborside Residential Project [Member]
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Dec. 31, 2011
Harborside Residential Project [Member]
item
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Sep. 30, 2012
Ironstate Development LLC [Member]
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Aug. 31, 2011
Wyndham [Member]
sqft
item
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Sep. 30, 2012
Wyndham [Member]
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Sep. 30, 2012
Wyndham [Member]
Land [Member]
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Jul. 31, 2012
Wegmans Food Markets, Inc. [Member]
sqft
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Sep. 30, 2012
Wegmans Food Markets, Inc. [Member]
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Sep. 30, 2012
Wegmans Food Markets, Inc. [Member]
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Sep. 30, 2012
Maximum [Member]
Wyndham [Member]
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Sep. 30, 2012
Minimum [Member]
Wyndham [Member]
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| Commitments And Contingencies [Line Items] | ||||||||||||||||||||||||||
| Project period | 20 years | 20 years | ||||||||||||||||||||||||
| Percentage of PILOT on project costs | 2.00% | 2.00% | ||||||||||||||||||||||||
| Total project costs | $ 49,500,000 | $ 170,900,000 | $ 12,100,000 | |||||||||||||||||||||||
| Payments in lieu of property taxes (PILOT) | 247,000 | 247,000 | 742,000 | 742,000 | 854,000 | 854,000 | 2,600,000 | 2,600,000 | ||||||||||||||||||
| Ground lease expense incurred | 102,000 | 102,000 | 305,000 | 305,000 | ||||||||||||||||||||||
| Number of properties | 7 | 127 | ||||||||||||||||||||||||
| Properties aggregate net book value | 129,600,000 | 1,700,000,000 | ||||||||||||||||||||||||
| Expiration year | 2016 | |||||||||||||||||||||||||
| Area of building, square feet | 203,000 | 140,000 | ||||||||||||||||||||||||
| Lease term | 15 years 3 months | |||||||||||||||||||||||||
| Number of lease extension options | 2 | |||||||||||||||||||||||||
| Lease extension term | 10 years | 5 years | ||||||||||||||||||||||||
| Delivery date to tenant | first quarter of 2013 | |||||||||||||||||||||||||
| Total estimated costs of the project | 243,000,000 | 53,500,000 | ||||||||||||||||||||||||
| Costs of the project incurred | $ 30,700,000 | $ 13,000,000 | $ 500,000 | |||||||||||||||||||||||
| Number of apartment units in each tower | 766 | 766 | ||||||||||||||||||||||||
| Holding and distribution pattern under operating agreement | Pursuant to the Development Agreement, the Company and Ironstate shall co-develop the Harborside Residential Project with Ironstate responsible for obtaining all required development permits and approvals. Major decisions with respect to the Harborside Residential Project will require the consent of the Company and Ironstate. The Company and Ironstate will have 85 and 15 percent interests, respectively, in the Harborside Residential Project. The Company will receive capital credit of $30 per approved developable square foot for its land. | |||||||||||||||||||||||||
| Percentage of interest in venture | 85.00% | 85.00% | ||||||||||||||||||||||||
| Ownership percentage of third party venture | 15.00% | |||||||||||||||||||||||||
| Capital credit receivable per square foot | 30 | |||||||||||||||||||||||||