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Real Estate Transactions (Consolidation) (Narrative) (Details) (USD $)
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0 Months Ended | 12 Months Ended | |
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Aug. 22, 2013
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Oct. 23, 2012
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Dec. 31, 2013
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Hudson Valley Land Holdings, L.L.C. [Member]
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| Real Estate Properties [Line Items] | |||
| Third party ownership percentage | 47.50% | ||
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Eastchester Project [Member]
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| Real Estate Properties [Line Items] | |||
| Business acquisition, cash paid | $ 4,900,000 | $ 2,100,000 | |
| Percentage of interest in venture | 76.25% | 26.25% | |
| Total project costs | 46,000,000 | ||
| Amount of project costs funded by members | 18,500,000 | ||
| Holding period gain (loss) | 0 | 0 | |
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Eastchester Project [Member] | Hudson Valley Land Holdings, L.L.C. [Member]
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| Real Estate Properties [Line Items] | |||
| Third party ownership percentage | 23.75% | ||
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150 Main Street, L.L.C. [Member] | JMP Eastchester, L.L.C. [Member]
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| Real Estate Properties [Line Items] | |||
| Third party ownership percentage | 26.25% | ||
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150 Main Street, L.L.C. [Member] | Eastchester Project [Member]
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| Real Estate Properties [Line Items] | |||
| Number of units | 108 | ||
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Construction Loan [Member] | 150 Main Street, L.L.C. [Member] | Eastchester Project [Member]
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| Real Estate Properties [Line Items] | |||
| Maximum borrowing capacity | $ 27,500,000 | ||