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Capital Stock (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended
Jul. 14, 2015
$ / shares
Apr. 10, 2015
$ / shares
Jan. 12, 2015
$ / shares
Nov. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
Dec. 31, 2014
$ / shares
shares
Dividends Payable [Line Items]              
Common stock, shares authorized | shares         400,000,000   400,000,000
Common stock, par value (in dollars per share)         $ 0.01   $ 0.01
Proceeds from sale of common stock | $         $ 7,766 $ 0  
Preferred stock, shares authorized | shares         10,000,000   10,000,000
Preferred stock, par value (in dollars per share)         $ 0.01   $ 0.01
Preferred Stock, shares outstanding | shares         0   0
Operating Partnership Units Option To Redeem For Common Stock Ratio         1    
Dividends per Share (in dollars per share)   $ 0.1250 $ 0.1025        
Subsequent Event [Member]              
Dividends Payable [Line Items]              
Dividends per Share (in dollars per share) $ 0.1250            
Unaffiliated Third Parties [Member]              
Dividends Payable [Line Items]              
Units of Partnership Interest, Amount | shares         0   0
Common Stock [Member]              
Dividends Payable [Line Items]              
Aggregate offering price | $       $ 200,000      
Common stock sold in offering | shares         524,606    
Share price of common stock sold         $ 15.18    
Proceeds from sale of common stock | $         $ 7,800    
Remaining amount under ATM program | $         $ 128,300