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v3.21.2

Equity - Additional Information (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2021 $ / shares shares | Sep. 30, 2021 USD ($) property $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Feb. 28, 2021 USD ($) | Dec. 31, 2018 shares | Jul. 31, 2015 shares
Equity [Line Items] |  |  |  |  |  |  |
Authorized amount (in shares) |  |  |  |  |  | 10,000,000 | 10,000,000
Treasury stock acquired (in shares) |  | 0 | 1,329,940 |  |  |  |
Treasury stock acquired, average cost (in dollars per share) | $ / shares |  |  | $ 8.28 |  |  |  |
Shares remaining available for repurchase (in shares) |  | 8,976,315 |  |  |  |  |
Series C cumulative convertible preferred, shares outstanding (in shares) |  | 1,935,400 |  | 1,935,400 |  |  |
Series C cumulative convertible preferred, liquidation preference | $ |  | $ 96,770,000 |  | $ 96,770,000 |  |  |
OP unit equivalent in common shares |  | 1.13 |  |  |  |  |
Redemption of OP units (in units) |  | 1,598,906 |  |  |  |  |
Partners' capital account (in units) |  | 824,000 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Properties Disposed by LCIF |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of properties sold | property |  | 3 |  |  |  |  |
LCIF |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Redemption of OP units (in units) |  | 1,598,906 |  |  |  |  |
LCIF | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Properties Disposed by LCIF |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of properties sold | property |  | 3 |  |  |  |  |
Series C Cumulative Convertible Preferred Stock |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Series C cumulative convertible preferred, shares outstanding (in shares) |  | 1,935,400 |  |  |  |  |
Preferred stock, dividend per annum (in dollars per share) | $ / shares |  | $ 3.25 |  |  |  |  |
Series C cumulative convertible preferred, liquidation preference | $ |  | $ 96,770,000 |  |  |  |  |
Convertible preferred stock, conversion ratio |  | 2.4339 |  |  |  |  |
Preferred stock conversion, threshold conversion price percentage (at least) |  | 1.25 |  |  |  |  |
Forward Contracts |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of shares sold (in shares) |  | 3,875,751 |  |  |  |  |
Proceeds from sale of stock | $ |  | $ 41,933,000 | $ 0 |  |  |  |
Share-based Payment Arrangement |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Shares granted (in shares) |  | 38,803 | 35,880 |  |  |  |
Grant date fair value | $ |  | $ 437,000 | $ 375,000 |  |  |  |
At-The-Market Program |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of shares sold (in shares) |  | 1,052,800 | 5,950,882 |  |  |  |
Proceeds from sale of stock | $ |  | $ 13,574,000 | $ 61,032,000 |  |  |  |
Sale of stock, authorized amount (up to) | $ |  |  |  |  | $ 350,000,000 |  |
Common shares amount available for issuance | $ |  | $ 294,985,000 |  |  |  |  |
At-The-Market Program | Forward Contracts |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of shares to be settled on a forward basis (in shares) |  | 4,763,989 | 0 |  |  |  |
Shares to be settled on forward basis, aggregate value | $ |  | $ 50,721,000 |  |  |  |  |
Underwritten Offering |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of shares sold (in shares) |  |  |  | 17,250,000 |  |  |
Proceeds from sale of stock | $ |  |  |  | $ 164,000,000 |  |  |
Sale of stock (in dollars per share) | $ / shares |  |  |  | $ 9.60 |  |  |
Underwritten Offering | Forward Contracts |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of shares to be settled on a forward basis (in shares) | 16,000,000 |  |  |  |  |  |
Shares to be settled on forward basis, aggregate value | $ |  | $ 189,777,000 |  |  |  |  |
Sale of stock (in dollars per share) | $ / shares | $ 12.11 |  |  |  |  |  |

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