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Note 9 - Earnings Per Share (Details) - Reconciliation of Basic and Diluted Earnings Per Share (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reconciliation of Basic and Diluted Earnings Per Share [Abstract]        
Numerator- net income (in Dollars) $ 36,497 $ 47,093 $ 125,223 $ 126,021
Denominator- weighted average shares        
Basic 68,556,051 68,198,006 68,511,409 68,026,705
Dilutive effect of stock compensation awards (1) 1,477,173 [1] 1,689,019 [1] 1,539,544 [1] 1,600,510 [1]
Diluted 70,033,224 69,887,025 70,050,953 69,627,215
Net income per share        
Basic (in Dollars per share) $ 0.53 $ 0.69 $ 1.83 $ 1.85
Diluted (in Dollars per share) $ 0.52 $ 0.67 $ 1.79 $ 1.81
[1] 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. Excludes approximately 8,000 and 18,000 stock options for the three and nine month periods ended September 30, 2013, respectively, as the impact of such awards was anti-dilutive.