Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Deferred compensation plan	$ 30,375	$ 30,361
Supplemental executive retirement plan	18,712	18,080
Operating lease liabilities	15,895	14,627
Interest rate swap derivative instruments	2,157	179
Other long-term liabilities	13,103	651
Total Other long-term liabilities	80,242	63,898
Deferred 2020 FICA payroll tax payments, CARES Act	12,700
Other Significant Noncash Transactions [Line Items]
Other long-term liabilities	13,103	$ 651
Deferred Payroll Taxes | COVID-19
Other Significant Noncash Transactions [Line Items]
Employee Benefits, Noncurrent, CARES Act	$ 12,700