Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 30

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

Name:	us-gaap_MaximumLengthOfTimeHedgedInCashFlowHedge
Namespace Prefix:	us-gaap
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

Financial Instruments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			12 Months Ended
Financial Instruments (Narrative) (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Cross Currency Swap [Member]	Dec. 31, 2010 Forward Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative instrument maturity period (years)					10
Number of multiple forward currency contracts matured						6
Number of interest rate swap agreements		2
Ineffectiveness in cash flow hedges	$ 0	$ 0	$ 0	$ 0
Derivative gains included in AOCI			$ 1,100,000