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Mortgage Notes Payable (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 0 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Feb. 20, 2013
Montvale Center [Member]
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Jun. 30, 2012
Montvale Center [Member]
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Feb. 05, 2013
Kingstowne One [Member]
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Jun. 30, 2013
140 Kendrick [Member]
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May 31, 2013
767 Fifth Avenue (The GM Building) [Member]
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Jun. 30, 2013
767 Fifth Avenue (The GM Building) [Member]
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May 31, 2013
First Mortgage [Member]
767 Fifth Avenue (The GM Building) [Member]
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May 31, 2013
Subordinated Debt [Member]
767 Fifth Avenue (The GM Building) [Member]
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May 31, 2013
Consolidation, Eliminations [Member]
767 Fifth Avenue (The GM Building) [Member]
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May 31, 2013
Company [Member]
767 Fifth Avenue (The GM Building) [Member]
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| Mortgage Notes Payable [Line Items] | |||||||||||||||
| Repayments of Secured Debt | $ 79,865,000 | $ 219,865,000 | $ 17,000,000 | $ 47,600,000 | |||||||||||
| Coupon/Stated Rate | 5.96% | 7.51% | 11.00% | 5.95% | 6.02% | ||||||||||
| Maturity date | May 05, 2013 | Jul. 01, 2013 | Jun. 09, 2017 | Oct. 07, 2017 | Oct. 07, 2017 | ||||||||||
| Penalty For Early Repayment Of Debt | 0.0 | 0 | |||||||||||||
| Gains from early extinguishments of debt | 152,000 | 274,000 | 152,000 | 1,041,000 | 300,000 | ||||||||||
| Asssumed debt | 1,300,000,000 | 306,000,000 | |||||||||||||
| Amount of debt extinguished | 25,000,000 | ||||||||||||||
| Gain on forgiveness of debt from discontinued operations | 0 | 0 | 20,182,000 | 0 | 20,200,000 | 17,800,000 | |||||||||
| MortgageLoans Accounted For At Fair Value Upon Consolidation | 1,500,000,000 | 311,700,000 | |||||||||||||
| Interest Rate Used To Account For Mortgage Loan At Fai rValue Upon Consolidation | 2.44% | 5.53% | |||||||||||||
| Accrued interest payable | 141,676,000 | 141,676,000 | 72,461,000 | 175,800,000 | |||||||||||
| Related party notes payable | $ 180,000,000 | $ 180,000,000 | $ 0 | $ 450,000,000 | $ 270,000,000 | $ 180,000,000 | |||||||||