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Financial Instruments - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Restricted investment: |  |
Rabbi Trusts | $ 56,681 | $ 51,247
Marketable equity and fixed income securities | 55,149 | 47,382
Other non-current assets | 19,179 | 18,887
Quoted Prices in Active Markets (Level 1) |  |
Restricted investment: |  |
Rabbi Trusts | 9,939 | 9,547
Marketable equity and fixed income securities | 1,885 | 19,010
Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Rabbi Trusts | 46,742 | 41,700
Marketable equity and fixed income securities | 53,264 | 28,372
Other non-current assets | 19,179 | 18,887
Interest Rate Swap |  |
Restricted investment: |  |
Interest rate swap derivatives | 3,104 | 3,849
Interest Rate Swap | Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Interest rate swap derivatives | $ 3,104 | $ 3,849

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