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Fair Value Measurements Fair Market Value of Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	$ 379,307,493atax_DebtFinancing	$ 345,359,000atax_DebtFinancing
Mortgages payable	76,445,451us-gaap_LongTermDebt	76,707,834us-gaap_LongTermDebt
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	379,307,493	345,359,000
Mortgages payable	76,445,451	76,707,845
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Debt financing	380,751,539	346,813,909
Mortgages payable	$ 75,876,463	$ 76,134,465

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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