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Note 12 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Numerator for basic and diluted earnings per share − Net income available to common shareholders | $ 304,153 | $ 347,055 | $ 391,382
Denominator for basic earnings per share – weighted average shares outstanding (in shares) | 79,058 | 81,089 | 83,100
Effect of dilutive securities− Employee and director stock options and restricted share awards (in shares) | 2,759 | 2,631 | 2,627
Denominator for diluted earnings per share − adjusted weighted average shares outstanding and assumed conversions (in shares) | 81,818 | 83,720 | 85,727
Basic earnings per common share (in dollars per share) | $ 3.85 | $ 4.28 | $ 4.71
Diluted earnings per common share and common share equivalents (in dollars per share) | $ 3.72 | $ 4.15 | $ 4.57

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