Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Unusual or Infrequent Item, or Both [Line Items]
Deferred compensation plan	$ 34,501	$ 30,361
Supplemental executive retirement plan	20,628	18,080
Operating lease liabilities	14,692	14,627
Interest rate swap derivative instrument	1,774	179
Other long-term liabilities	19,353	651
Total Other long-term liabilities	$ 90,948	$ 63,898
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Deferred Payroll Taxes | COVID-19
Unusual or Infrequent Item, or Both [Line Items]
Payroll tax CARES act liability	$ 19,300