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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Feb. 15, 2021 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Shares Authorized | 50,000,000 |  |  | 50,000,000 |  |  | 50,000,000
Preferred Stock, Shares Outstanding | 4,460,000 |  |  | 4,460,000 |  |  | 7,248,330
Preferred stock redemption charge | $ 0 |  | $ 0 | $ 2,987 | $ 3,914 |  |
Share-based compensation expense | $ 544 |  | $ 424 | 995 | 731 |  |
Stock issuance costs |  |  |  | $ 313 | $ 0 |  |
ATM Offering |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 3,463,708 |  |  |  |  |  |
Consideration received on transaction | $ 68,303 |  |  |  |  |  |
Stock issuance costs | $ 865 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Shares Authorized | 6,600,000 |  |  | 6,600,000 |  |  |
Preferred Stock, Shares Outstanding | 4,460,000 |  |  | 4,460,000 |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 |  |  | $ 25.00 |  |  |
Preferred Stock, Dividend Payment Terms |  |  |  | The Series C Preferred stock pays a cumulative cash dividend equivalent to 6.900% of the $25.00 liquidation preference per share each year until April 15, 2025 upon which date and thereafter, the Company will pay cumulative cash dividends at a percentage of the $25.00 liquidation value per share equal to an annual floating rate of three-month LIBOR plus a spread of 5.461%. |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 0.43125 |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Shares |  | 2,788,330 |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 7.625% |  |  |  |  |
Preferred Stock, Redemption Price Per Share |  |  |  |  |  | $ 25.15 |
Preferred stock redemption charge |  |  |  | $ 2,987 |  |  |

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