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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 |  |

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