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Note 3 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 78,661 $ 98,275 $ 150,269 $ 188,730
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 78,270 81,690 78,706 81,926
Effect of dilutive securities– Employee stock options and restricted stock awards (in shares) 2,508 2,466 2,761 2,575
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 80,778 84,156 81,467 84,501
Basic earnings per common share (in dollars per share) $ 1.01 $ 1.2 $ 1.91 $ 2.31
Diluted earnings per common share and common share equivalents (in dollars per share) $ 0.97 $ 1.17 $ 1.84 $ 2.23