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Note 12 - Earnings Per Share Calculation (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income available to common shareholders $ 66,053 $ 79,957 $ 49,217
Denominator for basic earnings per share – weighted average shares (in shares) 40,271 39,783 39,405
Employee and director stock options and restricted share awards (in shares) 822 1,111 1,101
Denominator for diluted earnings per share - adjusted weighted average shares and assumed conversions (in shares) 41,093 40,894 40,506
Basic earnings per common share (in dollars per share) $ 1.64 $ 2.01 $ 1.25
Diluted earnings per common share and common share equivalents (in dollars per share) $ 1.61 $ 1.96 $ 1.22