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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 80,278 $ 90,376 $ 269,008 $ 293,056
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 81,229 82,848 81,629 83,401
Effect of dilutive securities– Employee stock options and restricted share awards (in shares) 2,758 2,465 2,622 2,644
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 83,987 85,313 84,251 86,045
Basic earnings per common share (in dollars per share) $ 0.99 $ 1.09 $ 3.30 $ 3.51
Diluted earnings per common share and common share equivalents (in dollars per share) $ 0.96 $ 1.06 $ 3.19 $ 3.41