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Significant Accounting Policies - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 06, 2022 | Apr. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
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) |  |  | 24,637,268 |  | 24,637,268 |  | 24,592,098
Common stock, shares outstanding (in shares) |  |  | 24,637,268 |  | 24,637,268 |  | 24,592,098
Preferred stock, shares authorized (in shares) |  |  | 8,000,000 |  | 8,000,000 |  | 8,000,000
Issued shares of preferred stock (in shares) |  |  | 0 |  | 0 |  | 0
Outstanding shares of preferred stock (in shares) |  |  | 0 |  | 0 |  | 0
Common stock dividends declared (in dollars per share) |  | $ 0.60 | $ 0.60 | $ 0.60 | $ 1.20 | $ 1.20 |
Common stock dividends paid (in dollars per share) | $ 0.60 |  |  |  |  |  |
Accumulated other comprehensive income (loss) net of tax |  |  | $ (28,009,000) |  | $ (28,009,000) |  | $ 9,203,000
Tax from unrealized gains and losses on marketable securities |  |  |  |  | (100,000) |  | $ 200,000
Reclassifications from AOCI |  |  | $ 0 | $ 0 | $ 0 | $ 0 |

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