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Capital Stock - Narrative (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
vote
$ / shares
shares
Feb. 27, 2017
USD ($)
Dec. 31, 2015
$ / 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
Common stock votes | vote 1    
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
Operating partnership units option to redeem for common stock 1    
Unaffiliated Third Parties      
Dividends Payable [Line Items]      
Units of partnership interest, amount | shares 0   0
Common Stock      
Dividends Payable [Line Items]      
Aggregate offering price | $ $ 200,000,000    
Remaining amount under ATM program | $ 128,300,000    
Amount authorized to be repurchased | $ $ 150,000,000    
Shares repurchased during period | shares 728,237    
Average cost per share | $ / shares $ 8.92    
Value of repurchased stock | $ $ 6,500,000    
Subsequent Event      
Dividends Payable [Line Items]      
Value amount of shares authorized to be repurchased (up to) | $   $ 143,500,000