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Business Segments (Schedule Of Net Sales By Geographic Area) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total $ 903,582 $ 798,223 $ 729,604
United States      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 717,049 614,987 530,243
Exports From The United States | Asia      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 41,995 59,242 80,217
Exports From The United States | Canada      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 15,264 17,776 18,024
Exports From The United States | Europe      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 3,885 4,489 5,440
Exports From The United States | Latin America      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 6,867 4,937 2,169
Operations Outside The United States | Asia      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 626    
Operations Outside The United States | Brazil      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total $ 117,896 $ 96,792 $ 93,511