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Note 3 - Financing Arrangements (Details Textual)
$ in Thousands
Dec. 31, 2020
USD ($)
Long-Term Debt, Maturity, Year Two $ 361,300
Long-Term Debt, Maturity, Year Four 249,100
Long-Term Debt, Maturity, after Year Four 695,000
Senior Notes [Member] | Senior Notes, First Issuance [Member]  
Unsecured Debt, Total $ 250,000
Debt Instrument, Interest Rate, Stated Percentage 3.85%
Senior Notes [Member] | Senior Notes, Second Issuance [Member]  
Unsecured Debt, Total $ 350,000
Debt Instrument, Interest Rate, Stated Percentage 3.30%
Senior Notes [Member] | Senior Notes, Third Issuance [Member]  
Unsecured Debt, Total $ 700,000
Debt Instrument, Interest Rate, Stated Percentage 3.875%
Revolving Credit Facility [Member]  
Line of Credit Facility, Maximum Borrowing Capacity $ 750,000
Line of Credit Facility, Maximum Borrowing Capacity, Optional Increase 250,000
Long-term Line of Credit, Total $ 0