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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
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income available to common shareholders $ 114,887 $ 141,583 $ 139,062
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 54,866 54,988 58,835
Employee and director stock options and restricted share awards (in shares) 1,376 1,368 1,605
Denominator for diluted earnings per share - adjusted weighted average shares outstanding and assumed conversions (in shares) 56,242 56,356 60,440
Basic earnings per common share (in dollars per share) $ 2.09 $ 2.57 $ 2.36
Diluted earnings per common share and common share equivalents (in dollars per share) $ 2.04 $ 2.51 $ 2.30