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Employee benefits (Details 3) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 USD [Member] USD ($) | Dec. 31, 2011 USD [Member] USD ($) | Dec. 31, 2010 USD [Member] USD ($) | Dec. 31, 2012 Euro [Member] EUR (€) | Dec. 31, 2011 Euro [Member] EUR (€) | Dec. 31, 2010 Euro [Member] EUR (€)
Stock options |  |  |  |  |  |
Weighted average fair value of stock options granted | $ 11.87 | $ 10.42 | $ 11.10 | € 8.97 | € 8.28 | € 8.22
Weighted average share price at the exercise date of stock options | $ 50.88 | $ 41.94 | $ 33.79 | € 40.45 | € 29.39 | € 25.77
Aggregate intrinsic value of stock options exercised | $ 12,684 | $ 11,323 | $ 13,669 | € 71,331 | € 30,204 | € 22,720
Aggregate remaining contractual term of currently exercisable options (years) | 3 years 2 months 1 day | 1 year 9 months 18 days | 2 years 7 months 2 days | 3 years 7 months 2 days | 2 years 29 days | 2 years 10 months 10 days
Aggregate intrinsic value of exercisable stock options | 21,882 | 20,492 | 25,780 | 34,438 | 39,384 | 54,109
Aggregate intrinsic value of outstanding stock options | $ 22,433 | $ 20,791 | $ 28,024 | € 35,671 | € 45,141 | € 65,240

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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -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. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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