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5. Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
5. Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Other Long-term Debt, Current		$ 500	$ 500
Long-term debt, net of current maturities		1,196,943	10,514
Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	101.00%
3.3%, Senior Notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 395,700
Face amount of debt sold	400,000
3.7%, Senior Notes due 2032
Debt Instrument [Line Items]
Long-term debt	790,500
Face amount of debt sold	$ 800,000
Finance Lease Obligations [Member] \| Finance Leases and Other Debt [Member]
Debt Instrument [Line Items]
Other Long-term Debt		10,700	11,000
Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		(13,300)	0
Long-term debt		1,186,700	0
Senior Notes \| 3.3%, Senior Notes due 2027
Debt Instrument [Line Items]
Senior Notes, Noncurrent		400,000	0
Senior Notes \| 3.7%, Senior Notes due 2032
Debt Instrument [Line Items]
Senior Notes, Noncurrent		$ 800,000	$ 0
3.3%, Senior Notes due 2027 \| 3.3%, Senior Notes due 2027
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.30%
Debt Instrument, Interest Rate, Basis for Effective Rate	3.5346
3.7%, Senior Notes due 2032 \| 3.7%, Senior Notes due 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Debt Instrument, Interest Rate, Basis for Effective Rate	3.8429