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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items] |  |  |
Numbers of years cover defined contribution service plan for U.S. employees | 1 |  |
International Employees, Defined Contribution [Member] |  |  |
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items] |  |  |
Defined contribution benefit plans | $ 0.3 | $ 0.3 | $ 0.2
United States Employees, Defined Contribution [Member] |  |  |
Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items] |  |  |
Defined contribution benefit plans | $ 3.5 | $ 3.5 | $ 3.2

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- Definition Numbers of years cover defined contribution plans for U.S. employees. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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