Financial Instruments (Details 8) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Fair value of foreign exchange contracts
Derivative Asset, Fair Value	$ 772	$ 1,913
Designated as Hedging Instrument [Member] \| Other Assets [Member] \| Foreign Exchange Forward [Member]
Fair value of foreign exchange contracts
Derivative Asset, Fair Value	292	664
Not Designated as Hedging Instrument [Member] \| Other Assets [Member] \| Foreign Exchange Forward [Member]
Fair value of foreign exchange contracts
Derivative Asset, Fair Value	$ 480	$ 1,249

Fair value as of the balance sheet date of the gross assets less the gross liabilities of a derivative asset or group of derivative assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Name:	us-gaap_DerivativeAssetFairValueNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant