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Guarantees, Other Contingent Liabilities, And Other Matters (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2017
Jan. 09, 2017
Mar. 31, 2016
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]            
Face amount of guarantee including unpaid accrued interest   $ 35,000 $ 27,000     $ 13,000
Fair value of the guarantees   1,844 1,469     1,628
Other contingent liabilities   2,000        
Advances to suppliers current and non-current   125,000 116,000     134,000
Valuation allowance amount related to advances to suppliers   30,000 28,000     29,000
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers   414 (1,026)      
Aggregate balance of recoverable value added tax credits   41,000 51,000     52,000
Valuation allowance on recoverable value added tax credits   $ 11,000 19,000     $ 19,000
Percentage of outstanding convertible perpetual preferred stock converted   50.80%        
Preferred stock dividends   $ 11,061 $ 11,061      
Conversion of convertible perpetual preferred stock [Member]            
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]            
Preferred stock, shares outstanding         107,418  
Payments for repurchase of convertible perpetual preferred stock $ 178,400          
Preferred stock dividends       $ 15,000    
Repurchase of stock, retained earnings       $ 74,400    
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        
Non-cash reclassification of preferred stock converted   $ 107,600        
Common Stock [Member]            
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items]            
Conversion of Stock, Shares Issued   2,487,118        
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   14,000        
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