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Patents and other intangible assets (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
Intangible assets |  |
Cost | $ 97,354,000 | $ 94,459,000
Patents and other intangible assets, net | 37,515,000 | 41,457,000
Future Amortization expense |  |
2012 | 5,100,000 |
2013 | 4,500,000 |
2014 | 1,500,000 |
2015 | 1,400,000 |
2016 | 900,000 |
2017 and thereafter | 1,100,000 |
Patents and developed technologies |  |
Intangible assets |  |
Cost | 29,065,000 | 26,226,000
Accumulated amortization | (22,073,000) | (18,267,000)
Trademarks - definite lived (subject to amortization) |  |
Intangible assets |  |
Cost | 646,000 | 543,000
Accumulated amortization | (416,000) | (337,000)
Trademarks - indefinite lived (not subject to amortization) |  |
Intangible assets |  |
Cost | 23,057,000 | 23,104,000
Distribution networks |  |
Intangible assets |  |
Cost | 44,586,000 | 44,586,000
Accumulated amortization | $ (37,350,000) | $ (34,398,000)

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