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Note 12 - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income $ 77,747 $ 174,613 $ 174,539
Weighted average common shares outstanding - basic: (in shares) 68,096,051 68,538,248 68,081,632
Dilutive effect of stock compensation awards (in shares) [1] 1,104,246 1,632,796 1,585,897
Weighted average common shares outstanding - diluted: (in shares) 69,200,297 70,171,044 69,667,529
Net income per common share - basic: (in dollars per share) $ 1.14 $ 2.55 $ 2.56
Net income per common share - diluted: (in dollars per share) $ 1.12 $ 2.49 $ 2.51
[1] Excludes approximately 161,400, 81,600 and 10,300 stock options for the years ended December 31, 2015, 2014 and 2013, respectively, as the impact of such awards was anti-dilutive. Excludes approximately 1,000 shares of restricted stock for the year ended December 31, 2015, as the impact of such awards was anti-dilutive.