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Earnings Per Share and Equity Transactions - Narrative (Details) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 05, 2021 shares | Dec. 01, 2020 $ / shares | Jun. 30, 2021 shares | Sep. 30, 2020 shares | Jun. 30, 2020 shares | Mar. 31, 2020 shares | Sep. 30, 2021 shares | Sep. 30, 2020 shares | Dec. 31, 2020 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split ratio | 0.1 |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 712,090,283 |  | 71,261,403 |  |  |  | 71,261,403 |  | 71,998,654
Additional shares issued (in shares) | 52,375 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) | $ / shares |  | $ 21.70 |  |  |  |  |  |  |
Stock repurchase program, discount percentage |  | 25.00% |  |  |  |  |  |  |
Net asset value (in dollars per share) | $ / shares |  | $ 28.90 |  |  |  |  |  |  |
Repurchase of common stock under share repurchase plan (in shares) |  |  | 755,643 |  | 213,612 |  | 755,643 | 213,612 |
Issuance of common stock under dividend reinvestment plan (in shares) |  |  |  | 5,779 | 5,779 | 2,125 |  | 7,904 |

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