Derivative Instruments - Fair Value of Outstanding Derivative Contracts (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative Instruments
Asset Derivatives	$ 287	$ 1,168
Liability Derivatives	1,362	1,452
Interest rate swap contract \| Accrued pension and other liabilities
Derivative Instruments
Liability Derivatives	398
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Other current assets
Derivative Instruments
Asset Derivatives	203	670
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Other assets
Derivative Instruments
Asset Derivatives	1	179
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	656	30
Derivatives designated as hedging instruments \| Foreign exchange contracts \| Accrued pension and other liabilities
Derivative Instruments
Liability Derivatives	64	1
Derivatives designated as hedging instruments \| Natural gas contracts \| Other current assets
Derivative Instruments
Asset Derivatives	45	255
Derivatives designated as hedging instruments \| Natural gas contracts \| Other assets
Derivative Instruments
Asset Derivatives	13	43
Derivatives designated as hedging instruments \| Natural gas contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	68
Derivatives designated as hedging instruments \| Natural gas contracts \| Accrued pension and other liabilities
Derivative Instruments
Liability Derivatives	26
Derivatives not designated as hedging instruments \| Foreign exchange contracts \| Other current assets
Derivative Instruments
Asset Derivatives	25	21
Derivatives not designated as hedging instruments \| Foreign exchange contracts \| Accounts payable and accrued liabilities
Derivative Instruments
Liability Derivatives	$ 150	$ 1,421

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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