Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Long-Term Liabilities [Line Items]
Supplemental employees' retirement plan (SERP)	$ 97,246	$ 104,988
Total other long-term liabilities(1)	56,415	51,875
Other Liabilities
Other Long-Term Liabilities [Line Items]
Supplemental employees' retirement plan (SERP)	6,808	6,384
Deferred compensation	20,768	17,885
Long-term incentive plan	10,527	9,821
Noncurrent income taxes payable	3,390	3,371
Environmental remediation liability	5,525	4,610
Finance leases	5,559	6,261
Other	$ 3,838	$ 3,543