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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Taxes [Line Items]    
Income Tax Expense (Benefit) $ 3,216 $ 4,779
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards $ 100 $ 0
Effective Income Tax Rate Reconciliation, Percent 30.60% 32.60%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest $ 10,497 $ 14,649
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 $ 10,800  
Terphane Ltda [Member]    
Income Taxes [Line Items]    
BrazilianTaxCreditDeductionPeriod 24 months  
Current Effective Tax Rate Including Social Contribution On Income 15.25%  
LengthBrazilianTaxIncentive 10 years