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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract    
Total Income Tax Expense (Benefit) $ 9,204 $ 5,661