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Equity - Narrative (Details) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Jun. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2019 shares | Jun. 30, 2019 shares | Mar. 31, 2019 shares | Sep. 30, 2020 USD ($) vote $ / shares shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 $ / shares shares | Nov. 06, 2020 USD ($) | Nov. 05, 2020 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (up to) (in shares) | shares |  |  | 400,000,000 | 400,000,000 |  |  |  |  |  | 400,000,000 |  | 400,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |
Votes per common share | vote |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Shares sold (in shares) | shares |  |  |  | 4,760,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from shares sold |  |  |  | $ 114,500,000 |  |  |  |  |  |  |  |  |  |
Placement fees and expenses |  |  |  | 4,529,000 | $ 10,000 |  |  |  |  |  |  |  |  |
Value amount of shares authorized to be repurchased (up to) |  |  | $ 250,000,000 | $ 250,000,000 |  |  |  |  |  | $ 250,000,000 |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 1,119,438 |  |  |  |  |  |  |  |
Repurchased shares, average price per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 8.91 |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  | $ 10,000,000.0 |  |  |  | $ 10,000,000 | $ 42,828,000 |  |  |
Preferred stock, shares authorized (up to) (in shares) | shares |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  | 10,000,000 |  | 10,000,000 |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |
Preferred stock, dividend rate |  |  | 8.25% | 8.25% |  |  |  |  |  | 8.25% |  | 8.25% |  |
Liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 25.00 | $ 25.00 |  |  |  |  |  | $ 25.00 |  |  |  |
Redemption price per share (in dollars per share) | $ / shares |  |  | $ 25.00 | $ 25.00 |  |  |  |  |  | $ 25.00 |  |  |  |
Limited partnership, price per unit (in dollars per unit) | $ / shares |  | $ 11.76 |  |  |  |  |  |  |  |  |  |  |  |
Option to redeem for common stock ratio |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold (in shares) | shares | 135,481 |  |  | 0 |  |  |  |  |  |  |  |  |  |
Shares sold, price per share (in dollars per share) | $ / shares | $ 7.56 |  |  |  | $ 7.56 |  |  |  |  |  |  |  |  |
Net proceeds from shares sold | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Placement fees and expenses | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold (in shares) | shares |  |  | 4,760,000 |  |  |  |  |  |  |  |  |  |  |
Placement fees and expenses |  |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of stock |  |  | $ 119,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Unaffiliated Third Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units issued (in shares) | shares |  | 796,684 |  |  |  |  |  |  |  |  |  |  |  |
Operating partnerships units held (in shares) | shares |  |  | 855,191 | 855,191 |  |  |  |  |  | 855,191 |  | 792,131 |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price (up to) |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 1,119,438 | 280,436 | 1,004,589 | 3,143,922 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount remaining under offering program |  |  |  |  |  |  |  |  |  |  |  |  | $ 199,000,000.0 |
Remaining repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 165,200,000
Long-Term Incentive Plan Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units outstanding (in shares) | shares |  |  | 243,809 | 243,809 |  |  |  |  |  | 243,809 |  | 244,366 |  |

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