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Financial Instruments - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Recurring |  |
Restricted investments: |  |
Rabbi Trust | $ 36,982 | $ 42,937
Marketable equity and fixed income securities | 25,939 | 11,551
Fixed income securities |  | 1,927
Recurring | Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Rabbi Trust | 36,982 | 42,937
Marketable equity and fixed income securities | 25,939 | 11,551
Fixed income securities |  | 1,927
Interest Rate Swap |  |
Restricted investments: |  |
Interest rate swap derivatives | 4,600 |
Interest Rate Swap | Recurring |  |
Restricted investments: |  |
Interest rate swap derivatives | 4,613 |
Liabilities: |  |
Interest rate swap derivatives |  | 3,195
Interest Rate Swap | Recurring | Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Interest rate swap derivatives | $ 4,613 |
Liabilities: |  |
Interest rate swap derivatives |  | $ 3,195

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