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Guarantees, Other Contingent Liabilities, And Other Matters (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]      
Face amount of guarantee including unpaid accrued interest $ 2,000 $ 4,000 $ 13,000
Fair value of the guarantees 1,848 1,569 1,628
Other contingent liabilities 2,000    
Advances to suppliers current and non-current 101,000 96,000 134,000
Valuation allowance amount related to advances to suppliers 30,000 34,000 29,000
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers (113) (2,037)  
Aggregate balance of recoverable value added tax credits 47,000 61,000 52,000
Valuation allowance on recoverable value added tax credits 17,000 $ 23,000 $ 19,000
Santa Catarina [Member]      
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]      
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 15,000    
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 14,000    
Santa Catarina [Member] | Minimum [Member]      
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment 0    
Santa Catarina [Member] | Maximum [Member]      
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment 17,000    
Parana [Member]      
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]      
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 17,000    
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits 5,000    
Parana [Member] | Minimum [Member]      
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment 0    
Parana [Member] | Maximum [Member]      
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]      
Estimate of possible loss on remaining VAT audit assessment $ 5,000