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Income Tax Expense (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Partnership | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) Partnership
Income Tax Expense [Abstract] |  |  |
Investments in number of partnerships | Partnership | 4 |  | 4
Investment amount in partnerships | $ 1,088,000 | $ 1,088,000 | $ 1,218,000
Tax Credit Carryforward [Line Items] |  |  |
Investment tax credits | $ 1,143,000 | 1,143,000 |
Investment Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credits recognition period | 7 years |  |
Tax credits recognized as reduction of tax expense amount | $ 49,000 | $ 99,000 |

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