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Note 10 - Earnings Per Share (Details) - Reconciliation of Basic and Diluted Earnings Per Share - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reconciliation of Basic and Diluted Earnings Per Share [Abstract]        
Net income (numerator) (in Dollars) $ 14,844 $ 54,025 $ 34,529 $ 88,726
Weighted average shares (denominator)        
Basic 68,961,877 68,538,251 68,886,672 68,481,682
Dilutive effect of stock compensation awards (1) 1,101,186 [1] 1,549,725 [1] 1,213,268 1,606,756
Diluted 70,063,063 70,087,976 70,099,940 70,088,438
Net income per share        
Basic (in Dollars per share) $ 0.22 $ 0.79 $ 0.50 $ 1.30
Diluted (in Dollars per share) $ 0.21 $ 0.77 $ 0.49 $ 1.27
[1] Excludes approximately 142,900 stock options and 2,300 shares of restricted stock for the three month period ended June 30, 2015 and 104,400 stock options for the six month period ended June 30, 2015, as the impact of such awards was anti-dilutive. Excludes approximately 64,800 and 70,400 stock options for the three and six month periods ended June 30, 2014, respectively, as the impact of such awards was anti-dilutive.