Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Deferred compensation plan	$ 28,237	$ 30,361
Supplemental executive retirement plan	18,501	18,080
Operating lease liabilities	14,834	14,627
Interest rate swap derivative instruments	2,314	179
Other long-term liabilities	12,755	651
Total Other long-term liabilities	76,641	$ 63,898
Deferred 2020 FICA payroll tax payments, CARES Act	$ 12,300