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Equity - Narrative (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2021 USD ($) shares | Dec. 31, 2018 $ / shares shares | Sep. 30, 2021 vote $ / shares shares | Dec. 31, 2020 $ / shares shares
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized (in 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 |
Preferred stock, shares authorized (up to) (in shares) |  |  | 10,000,000 | 10,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 | $ 0.01
Liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 25.00 | $ 25.00
Limited partnership, price per unit (in dollars per unit) | $ / shares |  | $ 11.76 |  |
Option to redeem for common stock ratio |  | 1 |  |
Long-Term Incentive Plan Unit |  |  |  |
Class of Stock [Line Items] |  |  |  |
Units outstanding (in shares) |  |  | 135,388 | 243,809
Unaffiliated Third Parties |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common units issued (in shares) |  | 796,684 |  |
Operating partnerships units held (in shares) |  |  | 639,622 | 855,191
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Aggregate offering price (up to) | $ | $ 200.0 |  |  |
Shares sold (in shares) | 0 |  |  |
Amount remaining under offering program | $ | $ 200.0 |  |  |
Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold (in shares) |  |  | 4,760,000 | 4,760,000
Liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 25.00 |
Redemption price per share (in dollars per share) | $ / shares |  |  | $ 25.00 |

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