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Financial Instruments - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Restricted investments: |  |
Rabbi Trust | $ 42,937 | $ 35,749
Marketable equity and fixed income securities | 11,551 |
Fixed income securities | 1,927 | 1,932
Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Rabbi Trust | 42,937 | 35,749
Marketable equity and fixed income securities | 11,551 |
Fixed income securities | 1,927 | 1,932
Interest Rate Swap |  |
Liabilities: |  |
Interest rate swap derivatives | 3,195 | 6,015
Interest Rate Swap | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Interest rate swap derivatives | $ 3,195 | $ 6,015

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