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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
Quarterly financial information for the years ended December 31, 2019 and 2018 is presented below:
Three Months Ended
March 31, 2019June 30, 2019September 30, 2019December 31, 2019
Net sales$150,469  $200,933  $154,276  $149,379  
Gross profit$29,162  $37,128  $27,692  $27,390  
Net income$3,690  $9,564  $3,064  $26,250  
Basic earnings per common share$0.36  $0.92  $0.29  $2.52  
Diluted earnings per common share$0.35  $0.90  $0.29  $2.46  

Three Months Ended
March 31, 2018June 30, 2018September 30, 2018December 31, 2018
Net sales$122,454  $172,890  $167,094  $164,531  
Gross profit$22,192  $33,063  $31,303  $30,601  
Net (loss) income$(1,858) $5,434  $6,408  $(41,152) 
Basic (loss) earnings per common share$(0.18) $0.52  $0.62  $(3.97) 
Diluted (loss) earnings per common share$(0.18) $0.52  $0.61  $(3.97)