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Capital Stock (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Oct. 13, 2015
$ / shares
Jul. 14, 2015
$ / shares
Apr. 10, 2015
$ / shares
Jan. 12, 2015
$ / shares
Jan. 31, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Nov. 04, 2015
USD ($)
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) | $ / shares           $ 0.01     $ 0.01
Proceeds from sale of common stock           $ 7,796 $ 0    
Preferred stock, shares authorized | shares           10,000,000     10,000,000
Preferred stock, par value (in dollars per share) | $ / shares           $ 0.01     $ 0.01
Preferred Stock, shares outstanding | shares           0     0
Common stock partnership units option redemption ratio           1      
Dividends per Share (in dollars per share) | $ / shares   $ 0.1250 $ 0.1250 $ 0.1025          
Subsequent Event [Member]                  
Dividends Payable [Line Items]                  
Dividends per Share (in dollars per share) | $ / shares $ 0.1250                
Unaffiliated Third Parties [Member]                  
Dividends Payable [Line Items]                  
Operating partnerships units held (in shares) | shares           0     0
Common Stock [Member]                  
Dividends Payable [Line Items]                  
Aggregate offering price           $ 200,000      
Common stock sold in offering (in shares) | shares         524,606        
Share price of common stock sold (in dollars per share) | $ / shares         $ 15.18        
Proceeds from sale of common stock         $ 7,800        
Remaining amount under ATM program           $ 128,300      
Common Stock [Member] | Subsequent Event [Member]                  
Dividends Payable [Line Items]                  
Value amount of shares authorized to be repurchased               $ 150,000