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Fair Values - (Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2024 | Feb. 29, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023
Assets and liabilities recorded at fair value |  |  |  |  |
Purchases | $ 8,200 | $ 800 | $ 4,200 |  |
Unrealized losses recorded in other comprehensive income (loss) |  |  |  | $ 216 | $ 359
Recurring Basis | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets and liabilities recorded at fair value |  |  |  |  |
Beginning balance |  |  |  | 4,579 |
Purchases |  |  |  | 8,950 |
Unrealized losses recorded in other comprehensive income (loss) |  |  |  | (143) |
Ending balance |  |  |  | $ 13,386 | $ 4,579

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