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SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Depreciation and Amortization |  |  |
Depreciation expense | $ 9,706,000 | $ 8,934,000 | $ 7,994,000
Deferred Financing Costs |  |  |
Accumulated amortization of deferred financing costs | 3,096,000 | 2,909,000 |
Federal Income Taxes |  |  |
Accrued federal excise tax based on taxable income generated but not yet distributed | $ 290,000 |  |
Capital gain distributions (as a percent) | 73.00% |  |
Commercial properties |  |  |
Depreciation and Amortization |  |  |
Estimated useful life | 40 years |  |

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