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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Other Significant Noncash Transactions [Line Items] |  |  |
Deferred compensation plan | $ 38,749 |  | $ 34,501
Supplemental executive retirement plan | 0 | $ 20,000 | 20,628
Operating lease liabilities | 12,712 |  | 14,692
Interest rate swap derivative instruments | 296 |  | 1,774
Other long-term liabilities | 19,321 |  | 19,353
Total Other long-term liabilities | $ 71,078 |  | 90,948
Operating lease liabilities, financial statement location | Total Other long-term liabilities |  |
Deferred Payroll Taxes | COVID-19 |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Other long-term liabilities | $ 19,300 |  | $ 19,300

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