Derivative Instruments - Fair Value of Outstanding Derivative Contracts (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative Instruments
Asset Derivatives	$ 151	$ 468
Liability Derivatives	1,118	783
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Other current assets
Derivative Instruments
Asset Derivatives	8	411
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Other assets
Derivative Instruments
Asset Derivatives		6
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	958	13
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Accrued pension and other liabilities
Derivative Instruments
Liability Derivatives	97	3
Derivatives designated as hedging instruments \| Natural gas contracts \| Other current assets
Derivative Instruments
Asset Derivatives	78
Derivatives designated as hedging instruments \| Natural gas contracts \| Other assets
Derivative Instruments
Asset Derivatives	20
Derivatives designated as hedging instruments \| Natural gas contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	35	586
Derivatives designated as hedging instruments \| Natural gas contracts \| Accrued pension and other liabilities
Derivative Instruments
Liability Derivatives	5	89
Derivatives not designated as hedging instruments \| Foreign exchange contracts \| Other current assets
Derivative Instruments
Asset Derivatives	45	51
Derivatives not designated as hedging instruments \| Foreign exchange contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	$ 23	$ 92

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset.

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