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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Taxes [Line Items]            
Effective Tax Rate Reconciliation, Escrow Settlement         (6.40%)  
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations         0.20% (1.10%)
Income Tax Expense (Benefit) $ 4,422   $ (2,669)   $ 9,667 $ 1,864
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards         $ 100  
Effective Income Tax Rate Reconciliation, Percent         14.70% 7.60%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 12,696   $ 9,379   $ 65,847 $ 24,602
Effective Tax Rate Reconciliation Worthless Stock         (12.20%)  
Brazilian [Member]            
Income Taxes [Line Items]            
Effective income tax rate reconciliation social contribution on income         9.00%  
Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income         25.00%  
Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Including Social Contribution On Income         34.00%  
Excess Capital Losses From Investments And Other Related Items [Member]            
Income Taxes [Line Items]            
Deferred Tax Assets, Valuation Allowance $ 11,200       $ 11,200  
Flexible Packaging Films [Member]            
Income Taxes [Line Items]            
Foreign Earnings Repatriated       $ 10,700    
Worthless Stock Tax Deductible Amount   $ 8,100        
Foreign Income Tax Expense (Benefit), Continuing Operations   $ 400        
Terphane Ltda [Member]            
Income Taxes [Line Items]            
Current Effective Tax Rate Including Social Contribution On Income         15.25%  
LengthBrazilianTaxIncentive         10 years