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Financial Instruments - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Restricted investment: |  |
Rabbi Trusts | $ 44,712 | $ 36,982
Marketable equity and fixed income securities | 36,844 | 25,939
Quoted Prices in Active Markets (Level 1) |  |
Restricted investment: |  |
Rabbi Trusts | 7,014 |
Marketable equity and fixed income securities | 10,051 |
Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Rabbi Trusts | 37,698 | 36,982
Marketable equity and fixed income securities | 26,793 | 25,939
Interest Rate Swap |  |
Restricted investment: |  |
Interest rate swap derivatives | 3,313 | 4,613
Interest Rate Swap | Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Interest rate swap derivatives | $ 3,313 | $ 4,613

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