Market Concentrations and Risks (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Canada & Latin America [Member]
Carrying amounts of net assets belonging to international operations
Carrying amounts of net assets belonging to international operations	$ 47,274	$ 6,735
Europe, Africa & Middle East [Member]
Carrying amounts of net assets belonging to international operations
Carrying amounts of net assets belonging to international operations	69,302	23,530
Asia Pacific [Member]
Carrying amounts of net assets belonging to international operations
Carrying amounts of net assets belonging to international operations	$ 221,040	$ 228,018

Carrying amount of total assets less total liabilities of a designated geographic area if disclosed as a concentration risk.

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 94-6

-Paragraph 24

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 275

-SubTopic 10

-Section 50

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskNetAssetsAmountGeographicArea
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant