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Capital Stock - Narrative (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) vote $ / shares shares | Dec. 31, 2017 $ / shares shares
Class of Stock [Line Items] |  |
Common stock, shares authorized (up to) (in shares) | shares | 400,000,000 | 400,000,000
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01
Votes per common share | vote | 1 |
Remaining capacity | $ | $ 150,000,000 |
Preferred stock, shares authorized (up to) (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
Common stock partnership units option redemption ratio | 1 |
Common Stock |  |
Class of Stock [Line Items] |  |
Aggregate offering price (up to) | $ | $ 200,000,000 |
Common stock, sold (in shares) | shares | 7,472,946 |
Shares sold, price per share ( in dollars per share) | $ / shares | $ 12.56 |
Proceeds from sale of common stock, net | $ | $ 92,900,000 |
Remaining amount under ATM program | $ | 34,400,000 |
Value amount of shares authorized to be repurchased (up to) | $ | $ 150,000,000 |
Unaffiliated Third Parties |  |
Class of Stock [Line Items] |  |
Operating partnerships units held (in shares) | shares | 0 | 0

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