Long-term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term Debt, Noncurrent	$ 1,279,457	$ 643,622
2.70% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	2.70%	2.70%
Long-term Debt, Noncurrent	$ 393,843	$ 393,622
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	3.78%	3.78%
Long-term Debt, Noncurrent	$ 250,000	$ 250,000
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt, Noncurrent	249,614	0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Noncurrent	$ 386,000	$ 0