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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract        
Total Income Tax Expense (Benefit) $ 3,627 $ 562 $ 15,146 $ 2,310