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Financial Instruments (Schedule of Long-Term Debt) (Details) - Line of Credit - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt	$ 427,000	$ 350,000
Interest rate, effective percentage	3.42%	3.74%

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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