Number of foreign currency exchange rate derivatives held by the entity at the reporting date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Name:	us-gaap_NumberOfForeignCurrencyDerivativesHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Derivative Instruments and Hedging - Narrative (Details) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Forward Contracts USD ($)	Jun. 30, 2012 Forward Contracts JPY (¥)	Jun. 30, 2012 Foreign Buy-forward Contract [Member] contract	Jun. 30, 2012 Foreign Sell-forward Contract [Member] contract
Derivative [Line Items]
Number of Foreign Currency Derivatives Held				1	1
Maximum Remaining Maturity of Foreign Currency Derivatives	9 months
Notional Amount of Foreign Currency Derivative Purchase Contracts		$ 0.9	¥ 70.0
Notional Amount of Foreign Currency Derivative Sale Contracts		$ 1.1	¥ 88.5