Note 3 - Financing Arrangements (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($)
Long-Term Debt, Maturity, Year One	$ 356,000
Long-Term Debt, Maturity, Year Three	249,300
Long-Term Debt, Maturity, Year Five	695,900
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
Line of Credit Facility, Duration By Which Maturity Date May Be Extended Upon Request (Year)	1 year
Long-term Line of Credit, Total	$ 0

Represents the period of time by which the maturity date of the line of credit facility may be extended upon request.

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Optional increase in the maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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