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Financial Instruments - Fair Value Assets Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Restricted investments: |  |
Rabbi Trust | $ 51,247 | $ 36,982
Marketable equity and fixed income securities | 47,382 | 25,939
Other non-current assets | 18,887 | 18,094
Quoted Prices in Active Markets (Level 1) |  |
Restricted investments: |  |
Rabbi Trust | 9,547 |
Marketable equity and fixed income securities | 19,010 |
Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Rabbi Trust | 41,700 | 36,982
Marketable equity and fixed income securities | 28,372 | 25,939
Other non-current assets | 18,887 | 18,094
Interest Rate Swap |  |
Restricted investments: |  |
Interest rate swap derivatives | 3,849 | 4,613
Interest Rate Swap | Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Interest rate swap derivatives | $ 3,849 | $ 4,613

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