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Significant Accounting Policies - Authorized Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 10, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 32,000,000 |  |  |  | 32,000,000 | 32,000,000 |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 |
Common stock, shares issued (in shares) |  | 24,418,939 |  |  |  | 24,418,939 | 21,964,809 |
Common stock, shares outstanding (in shares) |  | 24,418,939 |  |  |  | 24,418,939 | 21,964,809 |
Issuance of common stock in public offering (in shares) | 2,185,000 |  |  |  |  |  |  |
Net proceeds from issuance of common stock | $ 220,200 |  |  |  |  | $ 220,248 | $ 0 | $ 0
Payments of stock issuance costs | $ 9,200 |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 8,000,000 |  |  |  | 8,000,000 | 8,000,000 |
Preferred stock, shares issued |  | 0 |  |  |  | 0 | 0 |
Preferred stock, shares outstanding |  | 0 |  |  |  | 0 | 0 |
Dividends declared, per share |  | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.60 | $ 2.40 | $ 2.10 | $ 1.50
Dividends paid, per share |  | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.60 |  |  |

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