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Note 4 - 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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Numerator for basic and diluted earnings per share – Net income available to common shareholders | $ 39,104 | $ 41,665 | $ 117,829 | $ 92,093
Denominator for basic earnings per share – weighted average shares outstanding (in shares) | 36,545 | 39,309 | 36,744 | 39,480
Effect of dilutive securities – Employee and director stock options and restricted share awards (in shares) | 806 | 1,079 | 881 | 1,155
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) | 37,351 | 40,388 | 37,625 | 40,635
Basic earnings per common share (in dollars per share) | $ 1.07 | $ 1.06 | $ 3.21 | $ 2.33
Diluted earnings per common share and common share equivalents (in dollars per share) | $ 1.05 | $ 1.03 | $ 3.13 | $ 2.27

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