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Capital Stock - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 08, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Nov. 30, 2015
USD ($)
Class of Stock [Line Items]          
Common stock, shares authorized (up to) | shares   400,000,000 400,000,000 400,000,000  
Common stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01 $ 0.01  
Preferred stock, shares authorized (up to) | shares   10,000,000 10,000,000 10,000,000  
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01 $ 0.01  
Preferred stock, shares outstanding | shares   0 0 0  
Common stock partnership units option redemption ratio     1    
Common Stock          
Class of Stock [Line Items]          
Aggregate offering price (up to) | $     $ 200,000,000    
Remaining amount under ATM program | $   $ 128,300,000 $ 128,300,000    
Value amount of shares authorized to be repurchased (up to) | $         $ 150,000,000
Average cost per share | $ / shares   $ 8.90      
Value of repurchased stock | $   $ 800,000      
Shares repurchased during period | shares   92,600      
Unaffiliated Third Parties          
Class of Stock [Line Items]          
Operating partnerships units held (in shares) | shares   0 0 0  
Subsequent Event          
Class of Stock [Line Items]          
Remaining capacity | $ $ 144,600,000        
Subsequent Event | Common Stock          
Class of Stock [Line Items]          
Average cost per share | $ / shares $ 8.92        
Value of repurchased stock | $ $ 4,600,000        
Shares repurchased during period | shares 516,162