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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards | $ 0 | $ 1,000 | $ 5,000
excess foreign tax credits repatriation | 6,400 |  |
Deferred Tax Benefit Expense Unremitted Earnings FCTA | 500 | 2,200 |
Benefit from the tax incentives |  | $ 100 | $ 100
Benefit from the tax incentives, per share |  | $ 0.00 | $ 0.00
Valuation allowance | 12,694 | $ 13,344 |
Balance of unrecognized state tax positions | 800 |  |
State And Foreign Net Operating Loss Carryforwards |  |  |
Income Taxes [Line Items] |  |  |
Operating Loss Carryforwards | 4,900 | 1,600 |
Valuation allowance | 1,500 | 1,500 | $ 2,800
Excess Capital Losses From Investments And Other Related Items |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowance | 10,900 | 11,200 | 11,400
Asset Impairments In Foreign Jurisdictions |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowance | $ 0 | $ 900 | $ 400
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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