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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net sales                 $ 1,399,551 $ 1,405,239 $ 1,334,951
Cost of sales                 877,568 904,747 865,951
Gross profit                 521,983 500,492 469,000
Net Income (Loss) Attributable to Parent                 $ 120,911 $ 112,938 $ 111,880
Net income per share: [Abstract]                      
Earnings Per Share, Basic                 $ 2.12 $ 1.91 $ 1.82
Earnings Per Share, Diluted                 $ 2.03 $ 1.85 $ 1.76
First Quarter [Member]                      
Net sales       $ 329,357       $ 323,945      
Cost of sales       213,155       212,567      
Gross profit       116,202       111,378      
Fees and Commissions       2,171       3,918      
Net Income (Loss) Attributable to Parent       $ 23,659       $ 19,824      
Net income per share: [Abstract]                      
Earnings Per Share, Basic       $ 0.41       $ 0.33      
Earnings Per Share, Diluted       $ 0.39       $ 0.32      
Second Quarter [Member]                      
Net sales     $ 325,402       $ 323,582        
Cost of sales     204,357       207,436        
Gross profit     121,045       116,146        
Fees and Commissions     2,826       3,127        
Net Income (Loss) Attributable to Parent     $ 24,737       $ 24,503        
Net income per share: [Abstract]                      
Earnings Per Share, Basic     $ 0.43       $ 0.41        
Earnings Per Share, Diluted     $ 0.41       $ 0.40        
Third Quarter [Member]                      
Net sales   $ 408,384       $ 413,462          
Cost of sales   253,876       264,691          
Gross profit   154,508       148,771          
Fees and Commissions   5,358       6,643          
Net Income (Loss) Attributable to Parent   $ 43,767       $ 42,885          
Net income per share: [Abstract]                      
Earnings Per Share, Basic   $ 0.77       $ 0.73          
Earnings Per Share, Diluted   $ 0.74       $ 0.70          
Fourth Quarter [Member]                      
Net sales $ 336,408       $ 344,250            
Cost of sales 206,180       220,053            
Gross profit 130,228       124,197            
Fees and Commissions 1,529       2,959            
Net Income (Loss) Attributable to Parent $ 28,748       $ 25,726            
Net income per share: [Abstract]                      
Earnings Per Share, Basic $ 0.51       $ 0.44            
Earnings Per Share, Diluted $ 0.49       $ 0.43