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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, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 BRL (R$)
Derivatives, Fair Value [Line Items]
Cost of Goods and Services Sold	$ 849,756	$ 767,550	$ 659,867
Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Exchange Rate, Translation	3,782.6			3,782.6
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Derivative, Notional Amount, Net	$ 22,950			R$ 86,812
Flexible Packaging Films [Member] [Domain]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) recognized in other comprehensive income	0	0	0
Aluminum Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	25,400	8,200
Amount of pre-tax gain (loss) recognized in other comprehensive income	(1,123)	1,501	394
Selling, General and Administrative Expenses [Member] | Flexible Packaging Films [Member] [Domain]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) recognized in other comprehensive income	(2,105)
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
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)	1,069	$ 1,210	$ (1,630)
Jan-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,025			R$ 7,380
Foreign Currency Exchange Rate, Translation	3,644.2			3,644.2
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Feb-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,025			R$ 7,397
Foreign Currency Exchange Rate, Translation	3,652.7			3,652.7
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Mar-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,025			R$ 7,410
Foreign Currency Exchange Rate, Translation	3,659.3			3,659.3
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Apr-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,025			R$ 7,430
Foreign Currency Exchange Rate, Translation	3,669.0			3,669.0
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
May-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,025			R$ 7,451
Foreign Currency Exchange Rate, Translation	3,679.5			3,679.5
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Jun-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,025			R$ 7,473
Foreign Currency Exchange Rate, Translation	3,690.4			3,690.4
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Jul-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,800			R$ 6,989
Foreign Currency Exchange Rate, Translation	3,882.6			3,882.6
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Aug-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,800			R$ 7,011
Foreign Currency Exchange Rate, Translation	3,895.0			3,895.0
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Sep-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,800			R$ 7,033
Foreign Currency Exchange Rate, Translation	3,907.0			3,907.0
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Oct-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,800			R$ 7,056
Foreign Currency Exchange Rate, Translation	3,920.3			3,920.3
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Nov-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,800			R$ 7,080
Foreign Currency Exchange Rate, Translation	3,933.1			3,933.1
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%
Dec-19 [Member] | Terphane Ltda [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,800			R$ 7,102
Foreign Currency Exchange Rate, Translation	3,945.5			3,945.5
Percentage of Coverage Using Cash Flow Hedges	0.00%			0.00%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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-Topic 220
-SubTopic 10
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