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Quarterly Results of Operations (unaudited) (Table) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales                 $ 1,405,239 $ 1,334,951 $ 1,314,223
Cost of sales                 904,747 865,951 831,847
Gross profit                 500,492 469,000 482,376
Net Income (Loss) Attributable to Parent                 $ 112,938 $ 111,880 $ 132,007
Net income per share: [Abstract]                      
Earnings Per Share, Basic                 $ 1.91 $ 1.82 $ 2.04
Earnings Per Share, Diluted                 $ 1.85 $ 1.76 $ 1.98
First Quarter [Member]                      
Net sales       $ 323,945       $ 304,624      
Cost of sales       212,567       196,276      
Gross profit       111,378       108,348      
Fees and Commissions       3,918       3,171      
Net Income (Loss) Attributable to Parent       $ 19,824       $ 23,637      
Net income per share: [Abstract]                      
Earnings Per Share, Basic       $ 0.33       $ 0.38      
Earnings Per Share, Diluted       $ 0.32       $ 0.36      
Second Quarter [Member]                      
Net sales     $ 323,582       $ 295,715        
Cost of sales     207,436       188,655        
Gross profit     116,146       107,060        
Fees and Commissions     3,127       3,187        
Net Income (Loss) Attributable to Parent     $ 24,503       $ 28,002        
Net income per share: [Abstract]                      
Earnings Per Share, Basic     $ 0.41       $ 0.45        
Earnings Per Share, Diluted     $ 0.40       $ 0.44        
Third Quarter [Member]                      
Net sales   $ 413,462       $ 391,992          
Cost of sales   264,691       255,895          
Gross profit   148,771       136,097          
Fees and Commissions   6,643       5,103          
Net Income (Loss) Attributable to Parent   $ 42,885       $ 39,248          
Net income per share: [Abstract]                      
Earnings Per Share, Basic   $ 0.73       $ 0.64          
Earnings Per Share, Diluted   $ 0.70       $ 0.62          
Fourth Quarter [Member]                      
Net sales $ 344,250       $ 342,620            
Cost of sales 220,053       225,125            
Gross profit 124,197       117,495            
Fees and Commissions 2,959       2,262            
Net Income (Loss) Attributable to Parent $ 25,726       $ 20,993            
Net income per share: [Abstract]                      
Earnings Per Share, Basic $ 0.44       $ 0.35            
Earnings Per Share, Diluted $ 0.43       $ 0.34