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Capital Stock - Series B Preferred Stock (Details) $ / shares in Units, $ in Thousands |  | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 09, 2021 USD ($) D M $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 $ / shares | Apr. 15, 2026 $ / shares | Apr. 15, 2025 $ / shares | Apr. 15, 2024 $ / shares | Apr. 15, 2023 $ / shares | Apr. 15, 2022 $ / shares | Aug. 05, 2021 shares
Sale of stock |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock | $ |  | $ 40,000 |  |  |  |  |  |  |  |
Stock issuance costs | $ |  | $ 3,248 | $ 231 |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.05 |  | $ 0.05 |  |  |  |  |  |
8.375% Series B Cumulative, Perpetual Preferred Stock |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |  |  |  |
Depositary share's fractional interest in share of preferred stock | shares | 0.001 | 0.001 |  |  |  |  |  |  |  |
Preferred stock, dividend rate (as a percent) | 8.375% | 8.375% |  | 8.375% |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.05 |  |  |  |  |  |  |  |  |
Liquidation preference (in dollars per share) | 25,000.00 |  |  |  |  |  |  |  |  |
Preferred stock, dividend amount (in dollars per share) | $ 2,093.75 |  |  |  |  |  |  |  |  |
Number of days in year over which dividend will be prorated and computed | D | 360 |  |  |  |  |  |  |  |  |
Number of months in year over which dividend will be prorated and compute | M | 12 |  |  |  |  |  |  |  |  |
Number of days in month over which dividend will be prorated and computed | D | 30 |  |  |  |  |  |  |  |  |
Redemption price at which company has option to redeem outstanding shares upon the occurrence of a delisting event or change of control event (in dollars per share) | $ 25,000.00 |  |  |  |  |  |  |  |  |
Share cap (in shares) | shares | 1,253.13 |  |  |  |  |  |  |  |  |
8.375% Series B Cumulative, Perpetual Preferred Stock | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |  |  |  |
Redemption price (in dollars per share) |  |  |  |  | $ 25,000.00 | $ 25,250.00 | $ 25,500.00 | $ 25,750.00 | $ 26,000.00 |
8.375% Series B Cumulative, Perpetual Preferred Stock | 2021 ATM Agreement [Member] |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |  |  |  |
Depositary share's fractional interest in share of preferred stock | shares |  |  |  |  |  |  |  |  |  | 0.001
Depositary Shares |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 1,600,000 |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) | $ 25.00 |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock | $ | $ 40,000 |  |  |  |  |  |  |  |  |
Stock issuance costs | $ | 2,900 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of preferred stock | $ | $ 37,100 |  |  |  |  |  |  |  |  |
Share cap (in shares) | shares | 1.25313 |  |  |  |  |  |  |  |  |
Depositary Shares | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |  |  |  |
Redemption price (in dollars per share) |  |  |  |  | $ 25.00 | $ 25.25 | $ 25.50 | $ 25.75 | $ 26.00 |
Depositary Shares | Spouse of James Neal, Chief Executive Officer and a director |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 8,000 |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) | $ 25.00 |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock | $ | $ 200 |  |  |  |  |  |  |  |  |
Depositary Shares | 2021 ATM Agreement [Member] |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  | 0 |  |  |  |  |  |  |  |

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