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Capital Stock - Narrative (Details)
 2 Months Ended 12 Months Ended
Feb. 27, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
vote
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / 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 (in shares) | shares   0 0
Common Stock      
Dividends Payable [Line Items]      
Aggregate offering price | $   $ 200,000,000  
Remaining amount under ATM program | $   200,000,000  
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]      
Number of share of stock sold | shares 230,719    
Price per share of stock sold (in dollars per share) | $ / shares $ 12.02    
Proceeds from sale of stock | $ $ 2,700,000    
Value amount of shares authorized to be repurchased (up to) | $ $ 150,000,000