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Interim Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Summary of Interim Financial Data
   
Three Months Ended
  
   
December 31,
2020
    
September 30,
2020
    
June 30,
2020
    
March 31,
2020
    
December 31,
2019
    
September 30,
2019
    
June 30,
2019
    
March 31,
2019
  
   
(In thousands, except share and per share data)
  
Net sales
   $ 228,286     $ 231,502     $ 220,648     $ 200,395     $ 164,772     $ 194,551     $ 206,453     $ 179,571  
Gross profit
   $ 92,392     $ 84,964     $ 92,405     $ 89,696     $ 71,263     $ 82,431     $ 83,444     $ 69,365  
Net income
   $ 43,301     $ 42,710     $ 47,218     $ 42,402     $ 35,497     $ 41,976     $ 35,710     $ 31,555  
Basic earnings per common share
   $ 0.37     $ 0.37     $ 0.41     $ 0.37     $ 0.31     $ 0.36     $ 0.31     $ 0.27  
Basic weighted average common shares outstanding
     115,791,757       115,773,030       115,733,934       116,259,058       116,591,434       116,800,120       116,972,384       117,086,956  
Diluted earnings per common share
   $ 0.37     $ 0.37     $ 0.41     $ 0.37     $ 0.31     $ 0.36     $ 0.31     $ 0.27  
Diluted weighted average common shares outstanding
     116,169,754       116,134,623       116,061,988       116,647,442       117,025,466       117,209,206       117,375,080       117,658,354