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Guarantees, Other Contingent Liabilities, And Other Matters (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Jan. 09, 2017
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]          
Face amount of guarantee including unpaid accrued interest   $ 31,000 $ 33,000 $ 17,000  
Fair value of the guarantees   970 1,722 1,177  
Other contingent liabilities   2,000      
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers   937 (2,038)    
Dividends paid on convertible perpetual preferred stock   0 7,374    
Repurchase of stock, retained earnings   (9,849) 0    
Series B 6.75% Convertible Perpetual Preferred Stock [Member]          
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]          
Preferred stock, shares converted to common stock 111,072        
Percentage of outstanding convertible perpetual preferred stock converted 50.80%        
Non-cash reclassification of preferred stock converted $ 107,600        
Preferred stock, shares outstanding         107,418
Payments for repurchase of convertible perpetual preferred stock       178,400  
Dividends paid on convertible perpetual preferred stock       15,000  
Repurchase of stock, retained earnings       74,400  
Common Stock [Member]          
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]          
Conversion of Stock, Shares Issued 2,487,118        
Advances to suppliers [Member]          
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]          
Advances to suppliers current and non-current   91,000 78,000 134,000  
Valuation Allowances and Reserves, Balance   22,000 28,000 27,000  
Recoverable value added tax credits [Member]          
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]          
Aggregate balance of recoverable value added tax credits   53,000 35,000 45,000  
Valuation Allowances and Reserves, Balance   17,000 $ 10,000 $ 13,000  
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   15,000      
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   15,000      
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