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Equity (Details) (USD $)
0 Months Ended 9 Months Ended
May 22, 2014
Sep. 30, 2014
Sep. 30, 2013
May 22, 2014
Dec. 31, 2013
Equity [Abstract]          
Sale of common stock (shares) 9,200,000        
Common shares of beneficial interest, par value (in dollars per share)   $ 0.01   $ 0.01 $ 0.01
Shares issued, price per share       $ 26.45  
Gross proceeds from issuance of shares $ 243,300,000        
Proceeds from issuance of common shares $ 232,800,000 $ 232,756,000 $ 327,545,000