Derivative Instruments - Fair Value of Outstanding Derivative Contracts (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments
Asset Derivatives	$ 468	$ 2,155
Liability Derivatives	783	861
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Other current assets
Derivative Instruments
Asset Derivatives	411	1,665
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Other assets
Derivative Instruments
Asset Derivatives	6	182
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	13
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Accrued pension and other liabilities
Derivative Instruments
Liability Derivatives	3
Derivatives designated as hedging instruments \| Natural gas contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	586	427
Derivatives designated as hedging instruments \| Natural gas contracts \| Accrued pension and other liabilities
Derivative Instruments
Liability Derivatives	89	372
Derivatives not designated as hedging instruments \| Foreign exchange contracts \| Other current assets
Derivative Instruments
Asset Derivatives	51	308
Derivatives not designated as hedging instruments \| Foreign exchange contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	$ 92	$ 62

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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