Derivative Instruments - Derivatives in Cash Flow Hedging Relationships (Details 5) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments
Loss relating to accumulated OCI expected to be recognized in earnings over the next 12 months	$ 200
Cash flow hedges
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	(337)	$ 1,313	$ 1,461
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)			198
Cash flow hedges \| Cost of products sold (excluding depreciation and amortization)
Derivative Instruments
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	1,136	705	463
Cash flow hedges \| Foreign exchange contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	647	2,095	1,326
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)			198
Cash flow hedges \| Foreign exchange contracts \| Cost of products sold (excluding depreciation and amortization)
Derivative Instruments
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	2,077	484	1,018
Cash flow hedges \| Natural gas contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	(984)	(782)	135
Cash flow hedges \| Natural gas contracts \| Cost of products sold (excluding depreciation and amortization)
Derivative Instruments
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	$ (941)	$ 221	$ (555)

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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