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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Taxes [Line Items]        
Effective Tax Rate Reconciliation, Escrow Settlement     (7.90%)  
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations     (0.20%) (2.00%)
Income Tax Expense (Benefit) $ 2,827 $ 1,317 $ 5,246 $ 4,533
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards     $ 100  
Effective Income Tax Rate Reconciliation, Percent     9.90% 29.80%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 47,031 4,725 $ 53,152 $ 15,223
Effective Tax Rate Reconciliation Worthless Stock     (15.20%)  
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