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Note 3 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Long-term debt $ 1,085,649 $ 986,278
Line of Credit [Member]    
Long-term Debt 241,400 139,000
Senior Notes [Member]    
Long-term Debt $ 844,200 $ 847,300