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Other Contingent Liabilities And Other Matters (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Other Contingent Liabilities and Other Matters [Line Items]      
Other contingent liabilities $ 1,000    
Net provision for losses (recoveries) on advances to suppliers (42) $ (328)  
Unsecured variable rate debt 150,000    
Stock repurchase program authorized amount 100,000    
Stock repurchase program remaining authorized repurchase amount 97,000    
Proceeds from Sales of Business, Affiliate and Productive Assets 1,300    
Sales agreement to sell common stock of subsidiary company, value 8,500    
Five-year term loan [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Long-Term Debt 225,000    
Seven-year term loan [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Long-Term Debt 295,000    
Advances to suppliers [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Advances to suppliers current and non-current 120,000 92,000 $ 153,000
Valuation allowances 17,000 18,000 19,000
Net provision for losses (recoveries) on advances to suppliers (42) (328)  
Recoverable value added tax credits [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Aggregate balance of recoverable value added tax credits 77,000 61,000 67,000
Valuation allowances 22,000 $ 19,000 $ 21,000
Santa Catarina [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 9,000    
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 9,000    
Loss contingency amount accrued 0    
Santa Catarina [Member] | Minimum [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment 0    
Santa Catarina [Member] | Maximum [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment 9,000    
Parana [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 11,000    
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 3,000    
Loss contingency amount accrued 0    
Parana [Member] | Minimum [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment 0    
Parana [Member] | Maximum [Member]      
Other Contingent Liabilities and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment $ 3,000