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Investments In Unconsolidated Joint Ventures (Recent Transactions) (Narrative) (Details) (USD $)
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9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Sep. 30, 2014
Harborside Unit A Urban Renewal, LLC [Member]
item
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Sep. 30, 2014
Harborside Unit A Urban Renewal, LLC [Member]
item
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May 21, 2014
Harborside Unit A Urban Renewal, LLC [Member]
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Sep. 30, 2014
Harborside Unit A Urban Renewal, LLC [Member]
Construction Loan [Member]
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Aug. 01, 2014
Harborside Unit A Urban Renewal, LLC [Member]
Construction Loan [Member]
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Sep. 30, 2014
Harborside Unit A Urban Renewal, LLC [Member]
Parent Company [Member]
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Sep. 30, 2014
Harborside Unit A Urban Renewal, LLC [Member]
Ironstate Harborside-A, LLC [Member]
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Sep. 30, 2014
KPG-MCG Curtis JV, LLC [Member]
sqft
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Sep. 30, 2014
KPG-MCG Curtis JV, LLC [Member]
Parent Company [Member]
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Sep. 30, 2014
KPG-MCG Curtis JV, LLC [Member]
Keystone Property Group [Member]
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Jun. 06, 2014
90-Day Loan 1 [Member]
Keystone Property Group [Member]
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Oct. 01, 2014
90-Day Loan 1 [Member]
Keystone Property Group [Member]
Subsequent Event [Member]
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Sep. 02, 2014
90-Day Loan 2 [Member]
Keystone Property Group [Member]
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Jun. 06, 2014
90-Day Loan 2 [Member]
Keystone Property Group [Member]
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Sep. 30, 2014
Harborside Residential Project [Member]
Harborside Unit A Urban Renewal, LLC [Member]
item
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Sep. 30, 2014
Harborside Residential Project [Member]
Harborside Unit A Urban Renewal, LLC [Member]
Parent Company [Member]
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Sep. 30, 2014
Curtis Center Property [Member]
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Sep. 30, 2014
Curtis Center Property [Member]
Keystone Property Group [Member]
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Sep. 30, 2014
Curtis Center Property [Member]
KPG-MCG Curtis JV, LLC [Member]
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Sep. 30, 2014
Curtis Center Property [Member]
KPG-MCG Curtis JV, LLC [Member]
Parent Company [Member]
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Sep. 30, 2014
Curtis Center Property [Member]
KPG-MCG Curtis JV, LLC [Member]
Keystone Property Group [Member]
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Sep. 30, 2014
Land [Member]
Harborside Unit A Urban Renewal, LLC [Member]
Parent Company [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||||||||||||||||
| Number of units | 763 | [1] | 763 | [1] | 763 | ||||||||||||||||||||||||||||||||
| Total project costs | $ 320,000,000 | $ 65,600,000 | |||||||||||||||||||||||||||||||||||
| State tax credit | 33,000,000 | ||||||||||||||||||||||||||||||||||||
| Maximum borrowing capacity | 192,000,000 | 192,000,000 | |||||||||||||||||||||||||||||||||||
| Amount outstanding | 0 | ||||||||||||||||||||||||||||||||||||
| Mortgage loan, maturity date | Aug. 01, 2029 | ||||||||||||||||||||||||||||||||||||
| Percentage of interest in venture | 85.00% | 85.00% | |||||||||||||||||||||||||||||||||||
| Investments in unconsolidated joint ventures | 239,767,000 | 181,129,000 | 28,080,000 | [1] | 28,080,000 | [1] | 30,600,000 | 5,400,000 | 60,440,000 | [2] | 125,000,000 | 62,500,000 | 62,500,000 | 5,500,000 | |||||||||||||||||||||||
| Capital credit receivable per developable square foot | 30 | ||||||||||||||||||||||||||||||||||||
| Aggregate capital credits | 20,600,000 | ||||||||||||||||||||||||||||||||||||
| Development of rental property | 4,881,000 | 12,954,000 | 12,600,000 | ||||||||||||||||||||||||||||||||||
| Percentage of operating return on capital | 75.00% | 25.00% | |||||||||||||||||||||||||||||||||||
| Internal rate of return | 18.00% | ||||||||||||||||||||||||||||||||||||
| Percentage of capital event cash flows distributed after initial internal rate of return reached | 65.00% | 35.00% | |||||||||||||||||||||||||||||||||||
| Percentage of interest in venture | [3] | 85.00% | [1],[3] | 85.00% | [1],[3] | 50.00% | [2],[3] | 50.00% | 50.00% | 50.00% | 50.00% | ||||||||||||||||||||||||||
| Area of property (in square feet) | 885,000 | [2] | |||||||||||||||||||||||||||||||||||
| Maturity period | 90 days | 90 days | |||||||||||||||||||||||||||||||||||
| Loan to affiliate | 62,276,000 | 16,425,000 | 52,300,000 | 10,000,000 | |||||||||||||||||||||||||||||||||
| Interest rate | 5.197% | [1],[4] | 5.197% | [1],[4] | 5.197% | 3.50% | 3.50% | ||||||||||||||||||||||||||||||
| Repayment of loans payable | 44,825,000 | 12,185,000 | 52,300,000 | 10,000,000 | |||||||||||||||||||||||||||||||||
| Lease period | 29 years | ||||||||||||||||||||||||||||||||||||
| Percentage of capital event cash flows distributed | 75.00% | 25.00% | |||||||||||||||||||||||||||||||||||
| Threshold of member unreturned capital for distribution of net operating cash flows | $ 0 | ||||||||||||||||||||||||||||||||||||
| Holding and distribution pattern under operating agreement | In general, the operating agreement of URL-Harborside provides that net operating cash flows are distributed first, to the members in respect of preferred return, as defined, until each member shall have received payment of the accrued and unpaid preferred return; and, thereafter, 75 percent to the Company and 25 percent to ISA. | ||||||||||||||||||||||||||||||||||||
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