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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 20, 2022 $ / shares | Nov. 25, 2020 | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 18, 2018 USD ($) $ / shares shares
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized | shares |  |  | 12,500,000 |  |  |  |
Common stock repurchase, authorized | $ |  |  |  |  |  |  | $ 30.0
Common stock repurchase, shares | shares |  |  |  |  |  | 117,000 |
Common stock repurchase, weighted average price per share |  |  |  |  |  | $ 19.91 |
Additional number of common stock shares repurchased | shares |  |  |  |  | 311,000 |  | 428,000
Additional common stock repurchased, weighted average price per share |  |  |  |  | $ 22.03 |  | $ 21.45
Stock price as percentage of market value |  |  | 100.00% |  |  |  |
Remaining shares authorized under DRIP | shares |  |  | 426,000 |  |  |  |
Accrued preferred stock dividends | $ |  |  | $ 1.2 | $ 1.2 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Dividends payable, date declared | Jan. 20, 2022 |  |  |  |  |  |
Common stock, dividends declared | $ 0.066 |  |  |  |  |  |
Dividends payable, date to be paid | Feb. 22, 2022 |  |  |  |  |  |
Dividends payable, date of record | Feb. 11, 2022 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Stockholders' equity, reverse stock split, conversion ratio |  | 0.15 |  |  |  |  |
Stockholders' equity, reverse stock split |  |  | Each 6.6 shares of the Company's issued and outstanding common stock were combined into one share of the Company's common stock. |  |  |  |
Series B [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Dividend rate percentage |  |  | 7.25% | 7.25% | 7.25% |  |
Redemption date |  |  | May 22, 2017 |  |  |  |
Redemption price per share |  |  | $ 25.00 |  |  |  |
Preferred stock, shares authorized | shares |  |  | 1,450,000 | 1,450,000 |  |  |
Series B [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared | $ 0.453125 |  |  |  |  |  |
Series C [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Dividend rate percentage |  |  | 6.50% | 6.50% | 6.50% |  |
Redemption date |  |  | Aug. 24, 2022 |  |  |  |
Redemption price per share |  |  | $ 25.00 |  |  |  |
Preferred stock, shares authorized | shares |  |  | 6,450,000 | 6,450,000 |  |  |
Series C [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared | $ 0.406250 |  |  |  |  |  |

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