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Financial Instruments - Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial Instruments |  |
Marketable securities | $ 107,919 | $ 60,850
Book Value |  |
Financial Instruments |  |
Cash and cash equivalents | 546,164 | 453,384
Marketable securities | 107,919 | 60,850
Fair Value |  |
Financial Instruments |  |
Cash and cash equivalents | 546,164 | 453,384
Marketable securities | 107,919 | 60,850
Secured long-term debt, including current portion | Book Value |  |
Financial Instruments |  |
Long-term debt | 507,560 | 481,780
Secured long-term debt, including current portion | Fair Value |  |
Financial Instruments |  |
Long-term debt | 507,560 | 481,780
Unsecured long-term debt | Book Value |  |
Financial Instruments |  |
Long-term debt | 262,766 | 262,766
Unsecured long-term debt | Fair Value |  |
Financial Instruments |  |
Long-term debt | $ 226,291 | $ 259,834

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