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Note 4 - Earnings Per Share (Details) - Earnings Per Share Calculation (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Numerator for basic and diluted earnings per share – Net income available to common shareholders (in Dollars) $ 23,478 $ 15,179 $ 55,330 $ 34,358
Denominator–        
Denominator for basic earnings per share – weighted average shares outstanding 40,008 39,558 39,700 39,411
Effect of dilutive securities–        
Employee and director stock options and restricted share awards 1,083 1,065 1,120 1,081
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions 41,091 40,623 40,820 40,492
Basic earnings per common share (in Dollars per share) $ 0.59 $ 0.38 $ 1.36 $ 0.87
Diluted earnings per common share and common share equivalents (in Dollars per share) $ 0.57 $ 0.37 $ 1.39 $ 0.85