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Note 4 - Earnings Per Share Calculation (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 19,883 $ 23,478 $ 56,240 $ 55,330
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 40,361 40,008 40,235 39,700
Effect of dilutive securities– Employee and director stock options and restricted share awards (in shares) 775 1,083 830 1,120
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 41,136 41,091 41,065 40,820
Basic earnings per common share (in dollars per share) $ 0.49 $ 0.59 $ 1.40 $ 1.39
Diluted earnings per common share and common share equivalents (in dollars per share) $ 0.48 $ 0.57 $ 1.37 $ 1.36