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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract        
Total Income Tax Expense (Benefit) $ 9,595 $ 3,993 $ 17,605 $ 13,197
EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract        
Statutary tax rate 39.00%      
Total Income Tax Expense (Benefit)     32.40% 29.00%