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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract        
Total Income Tax Expense (Benefit) $ 5,858 $ 769 $ 11,519 $ 1,748