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Accumulated Other Comprehensive Income (Reclassification Out Of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Sales $ 75,947 $ 64,491 $ 30,014 $ 53,555 $ 61,022 $ 60,203 $ 46,994 $ 61,218 $ 224,007 $ 229,437 $ 212,141
Less: Income tax expense                 (1,960) (8,991) $ (828)
Total reclassificaitons from AOCI                 (106) 908  
Unrealized Gains (Losses) on Cash Flow Hedges [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Total reclassificaitons from AOCI                 (106) 908  
Reclassification Out Of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Sales                 (139) 1,017  
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Total reclassificaitons from AOCI                 (106) 908  
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation Adjustments [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Sales                 (139) 1,017  
Less: Income tax expense                 (33) 109  
Total reclassificaitons from AOCI                 $ (106) $ 908