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Pro Forma Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2014
Jun. 30, 2014
Jun. 30, 2014
property
Jun. 30, 2013
Pro Forma Information        
Number of properties acquired     2  
Aggregate purchase price properties, excluding closing costs     $ 1,158,078  
Common shares issued in public offering 15,525,000 15,525,000    
Net proceeds after underwriting discounts from issuance of common shares issued in public offering 323,318 323,318 322,864 261,813
Interest rate (as a percent)   1.55% 1.55%  
Net proceeds after underwriting discounts from sale of senior unsecured notes   644,889    
Pro forma results of operations        
Total revenues     433,075  
Net income     73,469  
Net income per share(in dollars per share)     $ 0.36  
Senior unsecured notes 3.25%
        
Pro Forma Information        
Face Amount   400,000 400,000  
Interest rate (as a percent)   3.25% 3.25%  
Senior unsecured notes 4.75%
        
Pro Forma Information        
Face Amount   $ 250,000 $ 250,000  
Interest rate (as a percent)   4.75% 4.75%