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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Income Taxes [Line Items]    
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards $ 300 $ 200
Income Tax Holiday, Income Tax Benefits Per Share   $ 0.00
BrazilianTaxCreditDeductionPeriod 24 months  
Income Tax Holiday, Aggregate Dollar Amount   $ 100
Effective Income Tax Rate Reconciliation, Percent 35.20% 35.60%
Terphane Ltda    
Income Taxes [Line Items]    
Current Effective Tax Rate Reconciliation Social Contribution On Income   9.00%
Current Effective Tax Rate Excluding Social Contribution On Income   6.25%
Current Effective Tax Rate Including Social Contribution On Income   15.25%
Brazil    
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 $ 11,100