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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (Unaudited) QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
The following table sets forth selected financial information for all of the quarters during the years ended December 31, 2020 and 2019 (in thousands, except per share data):
 FirstSecondThirdFourth
 20202019202020192020201920202019
Net Sales$453,762 $468,589 $229,926 $468,711 $474,639 $477,761 $529,864 $443,836 
Gross Profit156,587 169,645 43,945 176,538 188,237 180,321 216,675 161,805 
Operating Income (Loss)105,027 121,596 (6,738)127,905 138,853 128,136 162,414 110,901 
Net Income (Loss)89,506 104,280 (2,374)108,959 117,093 111,898 143,339 99,547 
Earnings (Loss) Per Share (Basic)(1)
$0.36 $0.40 $(0.01)$0.42 $0.48 $0.44 $0.59 $0.39 
Earnings (Loss) Per Share (Diluted)(1)
$0.36 $0.40 $(0.01)$0.42 $0.48 $0.44 $0.58 $0.39 
(1)Basic and diluted earnings (loss) per share are computed independently for each quarter presented.  Therefore the sum of quarterly basic and diluted per share information may not equal annual basis and diluted earnings per share.