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Related Party Transactions (Details) - Related Party Transactions (Parentheticals) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Related Party Transactions [Abstract]    
Expenses Related to Discontinued Operations $ 3,145aei21_PartnershipAdministrationAffiliatesDiscontinuedOperations $ 871aei21_PartnershipAdministrationAffiliatesDiscontinuedOperations