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Equity - Narrative (Details) | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 26, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) vote $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Nov. 02, 2018 USD ($) | Nov. 01, 2018 USD ($)
Dividends Payable [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 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 |  |  |  |
Repurchase of common stock |  | $ 33,113,000 | $ 537,000 | $ 7,197,000 |  |
Common stock repurchased and retired |  | $ 32,182,000 |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  | 10,000,000 | 10,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares outstanding (in shares) | shares |  | 0 | 0 |  |  |
Operating partnership units option to redeem for common stock |  | 1 |  |  |  |
Distribution per unit (in dollars per share) | $ / shares |  | $ 11.76 |  |  |  |
Unaffiliated Third Parties |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Units of partnership interest, amount (in shares) | shares |  | 796,684 | 0 |  |  |
Common Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Aggregate offering price |  | $ 200,000,000 | $ 200,000,000 |  |  |
Number of shares of stock sold (in shares) | shares |  | 7,472,946 |  |  |  |
Price per share of stock sold (in dollars per share) | $ / shares |  | $ 12.56 |  |  |  |
Proceeds from sale of stock |  | $ 92,900,000 |  |  |  |
Amount authorized to be repurchased |  |  |  |  | $ 250,000,000 | $ 150,000,000
Shares repurchased during period (in shares) | shares |  | 3,384,359 |  |  |  |
Average cost per share (in dollars per share) | $ / shares |  | $ 9.49 |  |  |  |
Repurchase of common stock |  | $ 32,200,000 |  |  |  |
Common stock repurchased and retired |  | $ 34,000 |  |  |  |
Subsequent Event |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Value amount of shares authorized to be repurchased (up to) | $ 188,000,000 |  |  |  |  |
Subsequent Event | Common Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Shares repurchased during period (in shares) | shares | 3,143,922 |  |  |  |  |
Average cost per share (in dollars per share) | $ / shares | $ 9.52 |  |  |  |  |
Common stock repurchased and retired | $ 30,000,000 |  |  |  |  |

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