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Fair Value Measurements Fair Market Value of Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	$ 345,359,000atax_DebtFinancing	$ 257,274,000atax_DebtFinancing
Mortgages payable	76,707,834us-gaap_LongTermDebt	57,087,320us-gaap_LongTermDebt
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	345,359,000	257,274,000
Mortgages payable	76,707,845	57,087,320
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	346,813,909	258,639,691
Mortgages payable	$ 76,134,465	$ 58,117,798

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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