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