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Financial Instruments - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Restricted investments: |  |
Rabbi Trust | $ 40,752 | $ 42,937
Marketable equity and fixed income securities | 17,845 | 11,551
Fixed income securities |  | 1,927
Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Rabbi Trust | 40,752 | 42,937
Marketable equity and fixed income securities | 17,845 | 11,551
Fixed income securities |  | 1,927
Interest Rate Swap |  |
Liabilities: |  |
Interest rate swap derivatives | 76 | 3,195
Interest Rate Swap | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Interest rate swap derivatives | $ 76 | $ 3,195

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