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Income taxes (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Valuation Allowance [Line Items] |  |
Income Tax Expense (Benefit) | $ 2,517 | $ 2,821
Unrecognized Tax Benefits | $ 14,300 |

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