Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income			$ 2,541,000	$ 953,000
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage			4.20%	52.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			$ (475,000)	$ (318,000)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount			$ 12,562,000	$ 383,000
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent			(3.60%)	(73.80%)
effective income tax rate reconciliation, valuation allowance due to foreign losses			$ (2,395,000)	$ 185,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	21.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount			$ 1,864,000	$ 1,159,000
Effective Income Tax Rate Reconciliation Amount - FDII			(633,000)	(472,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount			$ (2,157,000)	$ 1,344,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent			3.10%	63.60%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount			$ 633,000	$ 87,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent			1.10%	4.80%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount			$ (148,000)	$ 173,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent			(0.20%)	9.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount			$ 363,000	$ 230,000
Effective Income Tax Rate Reconciliation Percent - FDII			(1.10%)	(25.90%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount			$ 2,400,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent			0.60%	12.60%
Effective Income Tax Rate Reconciliation Operating Loss Carryforwards Valuation Allowance For Foreign Country			(4.00%)	10.10%
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount			$ 0	$ 245,000
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance			0.00%	13.40%
Effective Income Tax Rate Reconciliation, Deduction, Amount			$ 8,424,000	$ 3,135,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount			0	1,788,000
Income Tax Expense (Benefit)	$ (43,000)	$ (6,699,000)	8,424,000	3,135,000
Goodwill, Impairment Loss	0	46,792,000	$ 0	$ 46,792,000
Effective Income Tax Rate Reconciliation, Percent			14.10%	172.10%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	17,090,000	$ (40,899,000)	$ 59,819,000	$ 1,821,000
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent			(4.20%)	26.40%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount			$ (188,000)	$ (414,000)
Income Tax Examination, Interest Accrued	$ 200,000		$ 200,000
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%
Flexible Packaging Films [Member]
Income Taxes [Line Items]
Foreign Tax Credit - Brazil			$ 2,100,000	$ 1,300,000
Terphane Ltda [Member]
Income Taxes [Line Items]
Current Effective Tax Rate Including Social Contribution On Income			15.25%
LengthBrazilianTaxIncentive			10 years