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Note 11 - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net income $ 34,036 $ 36,497 $ 68,565 $ 125,223
Weighted average shares (denominator)        
Weighted average common shares outstanding - basic: (in shares) 68,175,466 68,556,051 68,642,479 68,511,409
Dilutive effect of stock compensation awards (1) (in shares) [1] 1,006,999 1,477,173 1,138,821 1,539,544
Weighted average common shares outstanding - diluted: (in shares) 69,182,465 70,033,224 69,781,300 70,050,953
Net income per common share - basic: (in dollars per share) $ 0.50 $ 0.53 $ 1 $ 1.83
Net income per common share - diluted: (in dollars per share) $ 0.49 $ 0.52 $ 0.98 $ 1.79
[1] Excludes approximately 250,900 stock options and 11,000 shares of restricted stock for the three month period ended September 30, 2015, and 138,900 stock options and 800 shares of restricted stock for the nine month period ended September 30, 2015, as the impact of such awards was anti-dilutive. Excludes approximately 91,300 and 75,400 stock options for the three and nine month periods ended September 30, 2014, respectively, as the impact of such awards was anti-dilutive.