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Employee benefits (Tables) | 12 Months Ended
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Dec. 31, 2012
Employee benefits [Abstract] |
Bonus plan expenses |
Year ended December 31 (in thousands) |  | 2012 EUR |  |  | 2011 EUR |  |  | 2010 EUR |
Bonus expenses |  |  | 16,474 |  |  |  | 15,557 |  |  |  | 12,489 |
Bonus expenses under performance-related bonus plan |
Year ended December 31 (in thousands) |  | 2012 EUR |  |  | 2011 EUR |  |  | 2010 EUR |
Bonus expenses |  |  | 14,588 |  |  |  | 13,131 |  |  |  | 9,694 |
Assumption of the Black-Scholes option valuation of the fair value of the company's stock options |
Year ended December 31 |  | 2012 |  |  | 2011 |  |  | 2010 |
Weighted average share price (in EUR) |  |  | 40.3 |  |  |  | 28.0 |  |  |  | 24.1 |
Volatility (in percentage) |  |  | 25.6 |  |  |  | 37.8 |  |  |  | 36.4 |
Expected life (in years) |  |  | 5.0 |  |  |  | 4.8 |  |  |  | 4.6 |
Risk free interest rate |  |  | 2.1 |  |  |  | 2.9 |  |  |  | 2.5 |
Expected dividend yield (in EUR) |  |  | 1.45 |  |  |  | 1.25 |  |  |  | 1.06 |
Forfeiture rate1 |  |  | - |  |  |  | - |  |  |  | - |
1 | As of year end for each of the three years ended December 31, forfeitures are estimated to be nil.
Stock options |
|  | EUR-denominated |  |  | USD-denominated |
Year ended December 31 |  | 2012 |  |  | 2011 |  |  | 2010 |  |  | 2012 |  |  | 2011 |  |  | 2010 |
Weighted average fair value of stock options granted |  |  | 8.97 |  |  |  | 8.28 |  |  |  | 8.22 |  |  |  | 11.87 |  |  |  | 10.42 |  |  |  | 11.10 |
Weighted average share price at the exercise date of stock options |  |  | 40.45 |  |  |  | 29.39 |  |  |  | 25.77 |  |  |  | 50.88 |  |  |  | 41.94 |  |  |  | 33.79 |
Aggregate intrinsic value of stock options exercised (in thousands) |  |  | 71,331 |  |  |  | 30,204 |  |  |  | 22,720 |  |  |  | 12,684 |  |  |  | 11,323 |  |  |  | 13,669 |
Aggregate remaining contractual term of currently exercisable options (years) |  |  | 3.59 |  |  |  | 2.08 |  |  |  | 2.86 |  |  |  | 3.17 |  |  |  | 1.80 |  |  |  | 2.59 |
Aggregate intrinsic value of exercisable stock options (in thousands) |  |  | 34,438 |  |  |  | 39,384 |  |  |  | 54,109 |  |  |  | 21,882 |  |  |  | 20,492 |  |  |  | 25,780 |
Aggregate intrinsic value of outstanding stock options (in thousands) |  |  | 35,671 |  |  |  | 45,141 |  |  |  | 65,240 |  |  |  | 22,433 |  |  |  | 20,791 |  |  |  | 28,024 |
Stock option transactions |
|  | EUR-denominated |  |  | USD-denominated |
|  | Number of options |  |  | Weighted average exercise price per ordinary share (EUR) |  |  | Number of options |  |  | Weighted average exercise price per ordinary share (USD) |
Outstanding, January 1, 2012 |  |  | 5,133,659 |  |  |  | 24.48 |  |  |  | 1,792,305 |  |  |  | 34.01 |
Granted |  |  | 32,240 |  |  |  | 39.52 |  |  |  | 11,041 |  |  |  | 51.79 |
Exercised |  |  | (2,928,641) |  |  |  | 16.07 |  |  |  | (362,071) |  |  |  | 15.87 |
Forfeited |  |  | (5,530) |  |  |  | 18.22 |  |  |  | (350) |  |  |  | 33.75 |
Expired |  |  | (1,103,566) |  |  |  | 55.45 |  |  |  | (946,089) |  |  |  | 48.98 |
Outstanding, December 31, 2012 |  |  | 1,128,162 |  |  |  | 16.38 |  |  |  | 494,836 |  |  |  | 19.06 |
Exercisable, December 31, 2012 |  |  | 1,060,262 |  |  |  | 15.52 |  |  |  | 472,586 |  |  |  | 18.09 |
Outstanding stock options |
EUR-denominated |  |  | USD-denominated |
Range of exercise prices (EUR) |  |  | Number of outstanding options at December 31, 2012 |  |  | Weighted average remaining contractual life of outstanding options (years) |  |  | Range of exercise prices (USD) |  |  | Number of outstanding options at December 31, 2012 |  |  | Weighted average remaining contractual life of outstanding options (years) |
| 0 - 10 |  |  |  | - |  |  |  | - |  |  |  | 0 - 10 |  |  |  | 55,260 |  |  |  | 2.75 |
| 10 - 15 |  |  |  | 602,473 |  |  |  | 3.00 |  |  |  | 10 - 15 |  |  |  | 230,215 |  |  |  | 1.64 |
| 15 - 20 |  |  |  | 292,093 |  |  |  | 3.91 |  |  |  | 15 - 20 |  |  |  | 5,424 |  |  |  | 5.80 |
| 20 - 25 |  |  |  | 176,120 |  |  |  | 5.18 |  |  |  | 20 - 25 |  |  |  | 101,697 |  |  |  | 4.49 |
| 25 - 40 |  |  |  | 30,422 |  |  |  | 8.77 |  |  |  | 25 - 40 |  |  |  | 90,116 |  |  |  | 6.16 |
| 40 - 50 |  |  |  | 27,054 |  |  |  | 9.79 |  |  |  | 40 - 50 |  |  |  | 2,077 |  |  |  | 8.66 |
| 50 - 60 |  |  |  | - |  |  |  | - |  |  |  | 50 - 60 |  |  |  | 10,047 |  |  |  | 9.70 |
| Total |  |  |  | 1,128,162 |  |  |  | 3.89 |  |  |  | Total |  |  |  | 494,836 |  |  |  | 3.41 |
Summary of share plans |
|  | EUR-denominated |  |  | USD-denominated |
Year ended December 31 |  | 2012 |  |  | 2011 |  |  | 2010 |  |  | 2012 |  |  | 2011 |  |  | 2010 |
Total fair value at vesting date of shares vested during the year (in thousands) |  |  | 16,179 |  |  |  | 9,155 |  |  |  | 6,165 |  |  |  | 5,392 |  |  |  | 1,956 |  |  |  | 8,856 |
Weighted average fair value of shares granted |  |  | 36.15 |  |  |  | 28.09 |  |  |  | 23.51 |  |  |  | 47.71 |  |  |  | 39.00 |  |  |  | 31.66 |
Employee share issuances |
|  | EUR- denominated Number of shares |  |  | Weighted average fair value at grant date (EUR) |  |  | USD- denominated Number of shares |  |  | Weighted average fair value at grant date (USD) |
Conditional shares outstanding at January 1, 2012 |  |  | 1,479,297 |  |  |  | 24.19 |  |  |  | 264,891 |  |  |  | 32.35 |
Granted |  |  | 678,505 |  |  |  | 36.15 |  |  |  | 110,465 |  |  |  | 47.71 |
Vested/Issued |  |  | (421,902 | ) |  |  | 20.88 |  |  |  | (106,500 | ) |  |  | 31.05 |
Forfeited |  |  | (42,290 | ) |  |  | 19.91 |  |  |  | (19,762 | ) |  |  | 37.55 |
Conditional shares outstanding at December 31, 2012 |  |  | 1,693,610 |  |  |  | 29.92 |  |  |  | 249,094 |  |  |  | 40.71 |
Pension Costs |
Year ended December 31 (in thousands) |  | 2012 EUR |  |  | 2011 EUR |  |  | 2010 EUR |
Pension plan based on multi-employer union plan |  |  | 34,525 |  |  |  | 31,819 |  |  |  | 29,643 |
Pension plans based on defined contribution |  |  | 15,773 |  |  |  | 14,128 |  |  |  | 10,950 |
Pension and retirement expenses |  |  | 50,298 |  |  |  | 45,947 |  |  |  | 40,593 |

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- Definition Bonus expenses under performance-related bonus plan for senior management. + References No definition available. + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -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 Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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