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Note 8 - Stockholders' Equity and Stock Incentive Plans - Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Shares repurchased (2) (in shares) | [1],[2] | 1,628 | 2,474 | 4,847 | 7,588
Total cost, including brokerage fees (3) | [2],[3] | $ 106,302 | $ 134,996 | $ 312,656 | $ 434,769
Average repurchase price per share (4) (in dollars per share) | [2],[4] | $ 65.30 | $ 54.57 | $ 64.51 | $ 57.29
[1] | All shares repurchased have been retired and constitute authorized but unissued shares.
[2] | Shares repurchased reflect repurchases settled during the three and six months ended June 30, 2023 and 2022. These amounts exclude repurchases, if any, traded but not yet settled on or before June 30, 2023 and 2022, respectively.
[3] | Costs exclude 1% excise tax on corporate stock buybacks that was enacted under the Inflation Reduction Act of 2022 and became effective January 1, 2023.
[4] | Amounts in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers and excludes the 1% excise tax.

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