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Dividends and Distribution Payable (Details Textual) - $ / shares
Dec. 31, 2015
Dec. 02, 2015
Dec. 31, 2014
Dec. 31, 2013
Dividends Payable [Line Items]        
Dividends Payable, Amount Per Share (in dollars per share) $ 1.845   $ 1.740 $ 1.640
Agree Limited Partnership [Member]        
Dividends Payable [Line Items]        
Dividends Payable, Amount Per Share (in dollars per share)   $ 0.465