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Note 17 - Quarterly Financial Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
First Quarter [Member]        
Revenues from external customers       $ 1,193,535
Gross profit       193,622
Operating income       30,329
Segment income (loss) from continuing operations before taxes       27,388
Net income       $ 16,781
Earnings per share:        
Net income (in dollars per share)       $ 0.42
Net income (in dollars per share)       $ 0.42
Revenues from external customers       $ 1,193,535
Gross profit       193,622
Operating income       30,329
Segment income (loss) from continuing operations before taxes       27,388
Net income       $ 16,781
Second Quarter [Member]        
Revenues from external customers     $ 917,878  
Gross profit     207,633  
Operating income     35,560  
Segment income (loss) from continuing operations before taxes     31,962  
Net income     $ 19,576  
Earnings per share:        
Net income (in dollars per share)     $ 0.49  
Net income (in dollars per share)     $ 0.48  
Revenues from external customers     $ 917,878  
Gross profit     207,633  
Operating income     35,560  
Segment income (loss) from continuing operations before taxes     31,962  
Net income     19,576  
Third Quarter [Member]        
Revenues from external customers   $ 1,294,076    
Gross profit   208,008    
Operating income   36,030    
Segment income (loss) from continuing operations before taxes   32,462    
Net income   $ 19,883    
Earnings per share:        
Net income (in dollars per share)   $ 0.49    
Net income (in dollars per share)   $ 0.48    
Revenues from external customers   $ 1,294,076    
Gross profit   208,008    
Operating income   36,030    
Segment income (loss) from continuing operations before taxes   32,462    
Net income   $ 19,883    
Fourth Quarter [Member]        
Revenues from external customers $ 1,161,819      
Gross profit 175,684      
Operating income 19,357      
Segment income (loss) from continuing operations before taxes 15,991      
Net income $ 9,813      
Earnings per share:        
Net income (in dollars per share) $ 0.24      
Net income (in dollars per share) $ 0.24      
Revenues from external customers $ 1,161,819      
Gross profit 175,684      
Operating income 19,357      
Segment income (loss) from continuing operations before taxes 15,991      
Net income $ 9,813      
Operating income     34,932  
Operating income     $ 34,932