5. Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Other Long-term Debt, Current	$ 500	$ 500
Long-term debt, net of current maturities	1,198,005	1,197,716
Finance Lease Obligations [Member] \| Finance Leases and Other Debt [Member]
Debt Instrument [Line Items]
Other Long-term Debt	10,500	10,600
Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(12,000)	(12,400)
Long-term debt	1,188,000	1,187,600
Senior Notes \| 3.3%, Senior Notes due 2027
Debt Instrument [Line Items]
Senior Notes, Noncurrent	400,000	400,000
Senior Notes \| 3.7%, Senior Notes due 2032
Debt Instrument [Line Items]
Senior Notes, Noncurrent	$ 800,000	$ 800,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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