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Equity - 6.25% Series A Cumulative Redeemable Preferred Units of the Operating Partnership Narrative (Details) (USD $)
1 Months Ended 9 Months Ended
Mar. 31, 2014
Oct. 31, 2013
common_unit_holder
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2013
Class of Stock          
Number of common unit holders 1        
6.25% series A cumulative redeemable preferred units of the Operating Partnership
         
Class of Stock          
Shares outstanding of preferred stock   419,014 407,066 499,014  
Interest rate of preferred stock     6.25%    
Liquidation preference of preferred stock (dollars per share)     $ 25.00   $ 25.00
Number of common unit holders   1      
Noncontrolling interest, decrease from redemptions or purchase of interests (in shares) 11,948 80,000