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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Summary of significant accounting policies |
Schedule of the useful lives of long-lived assets |
|  | Years |
Buildings |  | 25 to 33 |
Plant and equipment |  | 2 to 10 |
Furniture and fixtures |  | 4 to 8 |
Instrumentation |  | 3 to 4 |
Schedule of the components of and changes in accumulated other comprehensive income |
(US$ in thousands) |  | Foreign Currency Translation Adjustments |  | Fair Value of Cross- Currency Swaps |  | Accumulated Other Comprehensive Income (Loss) |
Balance at December 31, 2009 |  | $ | 6,795 |  | $ | 395 |  | $ | 7,190 |
Unrealized loss on cross-currency swaps, net of tax of $(36) |  | — |  | (90 | ) | (90 | )
Foreign currency translation adjustment (1) |  | (1,710 | ) | — |  | (1,710 | )
Balance at December 31, 2010 |  | 5,085 |  | 305 |  | 5,390 |
Unrealized loss on cross-currency swaps, net of tax of $256 |  | — |  | (437 | ) | (437 | )
Foreign currency translation adjustment (1) |  | (3,192 | ) | — |  | (3,192 | )
Balance at December 31, 2011 |  | $ | 1,893 |  | $ | (132 | ) | $ | 1,761 |
(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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