Derivative Instruments And Hedging Activities (Derivatives Not Designated As Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Asset derivatives not designated as hedging instruments	$ 1,502	$ 55
Liability derivatives not designated as hedging instruments		159
Other Current Assets [Member] \| Foreign Exchange Forward [Member]
Asset derivatives not designated as hedging instruments	116	55
Other Current Assets [Member] \| Natural Gas Contracts [Member]
Asset derivatives not designated as hedging instruments	1,386
Accrued Liabilities [Member] \| Foreign Exchange Forward [Member]
Liability derivatives not designated as hedging instruments		$ 159

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant