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Financial Instruments Financial Instruments (Summary of Location and Fair Value of Currency Forward Derivative Financial Instruments - Terphane (Details). R$ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 BRL (R$)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 BRL (R$)
Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 26,150				R$ 102,793
Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar | R$		R$ 137,000
Foreign Currency Exchange Rate, Translation	3.9				3.9
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Aluminum Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 20,200		$ 25,400
Amount of pre-tax gain (loss) recognized in other comprehensive income	(2,359)		(1,123)	$ 1,501
Selling, General and Administrative Expenses [Member] | Flexible Packaging Films [Member] [Domain]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income to net income (effective portion)				(43)
Amount of pre-tax gain (loss) recognized in other comprehensive income	(856)		(2,105)	(561)
Cost of Sales [Member] | Flexible Packaging Films [Member] [Domain]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income to net income (effective portion)	62		62	62
Amount of pre-tax gain (loss) recognized in other comprehensive income	0		0	0
Cost of Sales [Member] | Aluminum Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income to net income (effective portion)	(2,736)		$ 1,069	$ 1,210
Jan-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,100				R$ 8,169
Foreign Currency Exchange Rate, Translation	3,890.0				3,890.0
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Feb-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,589
Foreign Currency Exchange Rate, Translation	3,904.0				3,904.0
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Mar-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,597
Foreign Currency Exchange Rate, Translation	3,907.6				3,907.6
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Apr-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,609
Foreign Currency Exchange Rate, Translation	3,913.1				3,913.1
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
May-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,621
Foreign Currency Exchange Rate, Translation	3,918.8				3,918.8
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Jun-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,635
Foreign Currency Exchange Rate, Translation	3,924.9				3,924.9
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Jul-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,652
Foreign Currency Exchange Rate, Translation	3,932.6				3,932.6
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Aug-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,671
Foreign Currency Exchange Rate, Translation	3,941.3				3,941.3
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Sep-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,689
Foreign Currency Exchange Rate, Translation	3,949.5				3,949.5
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Oct-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,707
Foreign Currency Exchange Rate, Translation	3,957.9				3,957.9
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Nov-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,200				R$ 8,725
Foreign Currency Exchange Rate, Translation	3,966.0				3,966.0
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Dec-20 [Member] [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,050				R$ 8,129
Foreign Currency Exchange Rate, Translation	3,965.3				3,965.3
Percentage of Coverage Using Cash Flow Hedges	0.00%				0.00%
Cash Flow Hedging [Member] | Foreign Currency Forwwards And Options [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net	$ (800)

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