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Description of the Business and Significant Accounting Policies (Short-term Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Description of the Business and Significant Accounting Policies |  |  |
Interest Income from invested cash and short-term investments | $ 26,300 | $ 26,000 |
Short-term investments | $ 653,255 |  | $ 721,210

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