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Selected Quarterly Consolidated Financial Data (unaudited)
12 Months Ended
Dec. 31, 2020
Selected Quarterly Financial Information [Abstract]  
Selected Quarterly Consolidated Financial Data (unaudited) Selected Quarterly Consolidated Financial Data (unaudited)
(in thousands, except per-share amounts)First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
2020
Net sales$559,417 $410,864 $512,869 $527,781 
Gross profit180,907 96,738 166,607 150,780 
Net income85,541 22,349 95,794 66,884 
Earnings per share - basic and diluted7.67 2.05 8.77 6.12 
2019

First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
Net sales$536,616 $563,417 $555,817 $534,445 
Gross profit152,869 170,833 162,727 143,440 
Net income62,205 74,174 67,805 50,102 
Earnings per share - basic and diluted5.57 6.63 6.06 4.48