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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Feb. 15, 2021 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) | 50,000,000 |  |  | 50,000,000 |  |  | 50,000,000
Preferred Stock, Shares Outstanding (in shares) | 4,460,000 |  |  | 4,460,000 |  |  | 7,248,330
Preferred stock redemption charge | $ 0 |  | $ 0 | $ 2,987 | $ 3,914 |  |
Stock issuance costs |  |  |  | 329 | 0 |  |
Share-based compensation expense | $ 760 |  | $ 568 | $ 1,755 | $ 1,299 |  |
ATM Offering |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 1,590,740 |  |  |  |  |  |
Consideration received on transaction | $ 27,898 |  |  |  |  |  |
Stock issuance costs | $ 353 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) | 6,600,000 |  |  | 6,600,000 |  |  |
Preferred Stock, Shares Outstanding (in shares) | 4,460,000 |  |  | 4,460,000 |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ 25.00 |  |  | $ 25.00 |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 0.43125 |  |  |  |  |  |
Series C Preferred Stock | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Dividend Payment Rate, Basis Spread on Variable Rate |  |  |  | 5.461% |  |  |
Series B Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 7.625% |  |  |  |  |
Stock Redeemed or Called During Period, Shares |  | 2,788,330 |  |  |  |  |
Preferred Stock, Redemption Price Per Share |  |  |  |  |  | $ 25.15 |
Preferred stock redemption charge |  |  |  | $ 2,987 |  |  |

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