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Fair value measurements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2011 M | Dec. 31, 2011 D | Dec. 31, 2011 Recurring Fair value | Dec. 31, 2010 Recurring Fair value | Dec. 31, 2011 Recurring Level 2 | Dec. 31, 2010 Recurring Level 2
Fair value measurements |  |  |  |  |  |
Maximum term of original maturity to classify instruments as cash equivalents (in days/months) | 3 | 90 |  |  |  |
Fair value of financial assets and liabilities |  |  |  |  |  |
Cross currency hedge |  |  | $ 1,011 | $ (262) | $ 1,011 | $ (262)

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- Definition Represents the maximum original term of maturity for an instrument to be classified as cash equivalent. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 + Details
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