Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Significant Noncash Transactions [Line Items]
Deferred compensation plan	$ 36,635	$ 34,501
Supplemental executive retirement plan	20,833	20,628
Operating lease liabilities	13,813	14,692
Interest rate swap derivative instruments	516	1,774
Other long-term liabilities	19,329	19,353
Total Other long-term liabilities	91,126	90,948
Deferred Payroll Taxes | COVID-19
Other Significant Noncash Transactions [Line Items]
Payroll tax payments deferred by CARES Act	$ 19,300	$ 19,300