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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |  |
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards | $ 4,800 | $ 1,000 | $ 4,900 |
Deferred Tax Benefit Expense Unremitted Earnings FCTA |  | 500 | 2,200 | $ 1,700
Benefit from the tax incentives |  | $ 100 | $ 100 | $ 2,500
Benefit from the tax incentives, per share |  | $ 0.00 | $ 0.00 | $ 0.08
Valuation allowance | 14,577 | $ 13,344 | $ 14,577 |
Balance of unrecognized state tax positions |  | 2,100 |  |
State And Foreign Net Operating Loss Carryforwards |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards | 3,000 | 1,600 | 3,000 |
Valuation allowance | 2,800 | 1,500 | 2,800 | $ 1,700
Excess Capital Losses From Investments And Other Related Items |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowance | 10,900 | 11,400 | 10,900 | 16,400
Asset Impairments In Foreign Jurisdictions |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowance | $ 400 | $ 900 | $ 400 | $ 1,900
Terphane Ltda |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax rate |  | 6.25% |  |
Current effective tax rate |  | 15.25% |  |
Percentage of social contribution on income included in current effective tax rate |  | 9.00% |  |
Brazilian |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal statutory income tax rate |  | 34.00% |  |
Income tax rate |  | 25.00% |  |
Percentage of social contribution on income included in federal statutory income tax rate |  | 9.00% |  |
Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net Operating Loss Carrforward Expiration Period |  | 5 years |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net Operating Loss Carrforward Expiration Period |  | 8 years |  |

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