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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Useful Lives | The useful lives are as follows:
|  | Years |
Buildings |  |  | 25 to 33 |
Plant and equipment |  |  | 2 to 10 |
Furniture and fixtures |  |  | 4 to 8 |
Instrumentation |  |  | 3 to 4 |
Components of Changes in Accumulated Other Comprehensive Income | The components of and changes in accumulated other comprehensive income are as follows:
(US$ in thousands) |  | Foreign Currency Translation Adjustments |  |  | Fair Value of Cross- Currency Swaps |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at December 31, 2010 |  | $ | 5,085 |  |  | $ | 305 |  |  | $ | 5,390 |
Unrealized loss on cross-currency swaps, net of tax benefit of $256 |  |  | — |  |  |  | (437 | ) |  |  | (437 | )
Foreign currency translation adjustment (1) |  |  | (3,192 | ) |  |  | — |  |  |  | (3,192 | )
Balance at December 31, 2011 |  |  | 1,893 |  |  |  | (132 | ) |  |  | 1,761 |
Unrealized gain on cross-currency swaps, net of tax of $153 |  |  | — |  |  |  | 263 |  |  |  | 263 |
Foreign currency translation adjustment (1) |  |  | 480 |  |  |  | — |  |  |  | 480 |
Balance at December 31, 2012 |  | $ | 2,373 |  |  | $ | 131 |  |  | $ | 2,504 |
(1) | As the cash generally remains permanently invested in the non U.S. dollar denominated foreign subsidiaries, no deferred taxes are recognized on the related foreign currency translation adjustment.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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