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Capital Stock (Details)
 6 Months Ended
Jul. 12, 2016
$ / shares
Apr. 12, 2016
$ / shares
Jan. 12, 2016
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Nov. 30, 2015
USD ($)
Dividends Payable [Line Items]            
Common stock, shares authorized (up to) | shares       400,000,000 400,000,000  
Common stock, par value (in dollars per share) | $ / shares       $ 0.01 $ 0.01  
Dividends per Share (in dollars per share) | $ / shares   $ 0.1250 $ 0.1250      
Preferred stock, shares authorized (up to) | 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    
Unaffiliated Third Parties            
Dividends Payable [Line Items]            
Operating partnerships units held (in shares) | shares       0 0  
Common Stock            
Dividends Payable [Line Items]            
Aggregate offering price (up to) | $       $ 200,000,000    
Remaining amount under ATM program | $       $ 128,300,000    
Value amount of shares authorized to be repurchased (up to) | $           $ 150,000,000
Subsequent Event            
Dividends Payable [Line Items]            
Dividends per Share (in dollars per share) | $ / shares $ 0.1250