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Note 4 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Long-term debt	$ 1,195,708	$ 1,261,738
Less current portion of long-term debt	(249,902)	0
Total long-term debt	1,195,700	1,261,700
Senior Notes [Member]
Long-term debt	947,800	947,000
Revolving Credit Facility [Member]
Long-term debt	$ 497,800	$ 314,700

X

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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