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Share-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Share-Based Compensation by Line Item in Condensed Consolidated Statements of Operations | The following table shows the detail of share-based compensation by line item in the consolidated statements of operations for the years ended December 31, 2012, 2011 and 2010 and the assumptions for each of these years in which grants were awarded:
(US$ in thousands, except assumptions) |  | Year Ended December 31, 2012 |  |  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2010 (1) |
Cost of sales |  | $ | 592 |  |  | $ | 153 |  |  | $ | 210 |
Sales and marketing |  |  | 1,550 |  |  |  | 2,031 |  |  |  | 3,505 |
General and administrative |  |  | 4,023 |  |  |  | 4,322 |  |  |  | 4,105 |
Research and development |  |  | 138 |  |  |  | 142 |  |  |  | 318 |
Total |  | $ | 6,303 |  |  | $ | 6,648 |  |  | $ | 8,138 |
Schedule of Stock Option Activity | Summaries of the status of the Company’s stock option plans as of December 31, 2012 and 2011 and changes during the year ended December 31, 2012 are presented below:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |
Outstanding at December 31, 2011 |  |  | 2,559,272 |  |  | $ | 33.41 |  |  |  |  |
Granted |  |  | 347,250 |  |  | $ | 40.46 |  |  |  |  |
Exercised |  |  | (716,564 | ) |  | $ | 31.50 |  |  |  |  |
Forfeited |  |  | (244,003 | ) |  | $ | 40.50 |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 1,945,955 |  |  | $ | 34.50 |  |  |  | 5.39 |
Vested and expected to vest at December 31, 2012 |  |  | 1,903,616 |  |  | $ | 34.42 |  |  |  | 5.31 |
Options exercisable at December 31, 2012 |  |  | 1,448,293 |  |  |  |  |  |  |  | 4.20 |
Schedule of Stock Options Outstanding and Exercisable by Price Range | Outstanding and exercisable by price range as of December 31, 2012
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
$10.42 – $25.01 |  |  | 253,661 |  |  |  | 5.09 |  |  | $ | 23.40 |  |  |  | 253,661 |  |  | $ | 23.40 |
$25.05 – $28.95 |  |  | 326,383 |  |  |  | 5.30 |  |  | $ | 26.96 |  |  |  | 314,383 |  |  | $ | 26.97 |
$29.23 – $33.01 |  |  | 314,433 |  |  |  | 6.84 |  |  | $ | 31.60 |  |  |  | 167,102 |  |  | $ | 31.44 |
$33.08 – $38.11 |  |  | 347,859 |  |  |  | 3.50 |  |  | $ | 37.49 |  |  |  | 307,194 |  |  | $ | 37.51 |
$38.40 – $39.94 |  |  | 282,687 |  |  |  | 6.61 |  |  | $ | 39.68 |  |  |  | 126,687 |  |  | $ | 39.69 |
$40.27 – $41.37 |  |  | 210,000 |  |  |  | 7.05 |  |  | $ | 41.22 |  |  |  | 68,334 |  |  | $ | 41.20 |
$43.04 – $45.84 |  |  | 188,932 |  |  |  | 3.47 |  |  | $ | 44.63 |  |  |  | 188,932 |  |  | $ | 44.63 |
$50.15 – $50.15 |  |  | 12,500 |  |  |  | 4.29 |  |  | $ | 50.15 |  |  |  | 12,500 |  |  | $ | 50.15 |
$50.50 – $50.50 |  |  | 2,000 |  |  |  | 4.01 |  |  | $ | 50.50 |  |  |  | 2,000 |  |  | $ | 50.50 |
$50.99 – $50.99 |  |  | 7,500 |  |  |  | 4.04 |  |  | $ | 50.99 |  |  |  | 7,500 |  |  | $ | 50.99 |
$10.42 – $50.99 |  |  | 1,945,955 |  |  |  | 5.39 |  |  | $ | 34.50 |  |  |  | 1,448,293 |  |  | $ | 33.54 |
Schedule of Changes in Restricted Stock |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested as of December 31, 2011 |  |  | 69,000 |  |  | $ | 29.23 |
Granted |  |  | 149,500 |  |  | $ | 40.93 |
Vested |  |  | (28,336 | ) |  | $ | 29.23 |
Cancelled |  |  | (29,333 | ) |  | $ | 38.87 |
Non-vested as of December 31, 2012 |  |  | 160,831 |  |  | $ | 38.34 |

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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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