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Note 17 - Unaudited Quarterly Financial Data (Details) - Quarterly Financial Data (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
2013      
Revenues $ 3,384,705 $ 3,090,567 $ 2,580,611
Gross Profit 572,014 500,767 423,277
Operating income 91,754 114,200 97,338
Income before income taxes 81,061 101,183 90,177
Net income 49,217 62,455 55,213
Earnings per share:      
Earnings per share, basic (in Dollars per share) $ 1.25 $ 1.62 $ 1.46
Earnings per share, diluted (in Dollars per share) $ 1.22 $ 1.57 $ 1.42
First Quarter [Member]
     
2013      
Revenues 756,788 777,329  
Gross Profit 133,788 128,260  
Operating income 24,613 29,380  
Income before income taxes 22,100 26,076  
Net income 13,547 15,906  
Earnings per share:      
Earnings per share, basic (in Dollars per share) $ 0.35 $ 0.41  
Earnings per share, diluted (in Dollars per share) $ 0.34 $ 0.40  
Second Quarter [Member]
     
2013      
Revenues 789,674 835,844  
Gross Profit 137,688 129,636  
Operating income 11,789 31,966  
Income before income taxes 9,309 28,559  
Net income 5,632 17,422  
Earnings per share:      
Earnings per share, basic (in Dollars per share) $ 0.14 $ 0.45  
Earnings per share, diluted (in Dollars per share) $ 0.14 $ 0.44  
Third Quarter [Member]
     
2013      
Revenues 913,064 745,133  
Gross Profit 150,312 125,171  
Operating income 27,870 27,627  
Income before income taxes 25,089 24,244  
Net income 15,179 14,909  
Earnings per share:      
Earnings per share, basic (in Dollars per share) $ 0.38 $ 0.38  
Earnings per share, diluted (in Dollars per share) $ 0.37 $ 0.38  
Fourth Quarter [Member]
     
2013      
Revenues 925,179 732,261  
Gross Profit 150,226 117,700  
Operating income 27,482 25,227  
Income before income taxes 24,563 22,304  
Net income $ 14,859 $ 14,218  
Earnings per share:      
Earnings per share, basic (in Dollars per share) $ 0.38 $ 0.37  
Earnings per share, diluted (in Dollars per share) $ 0.37 $ 0.36