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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract        
Total Income Tax Expense (Benefit) $ 3,993 $ 5,858 $ 13,197 $ 11,519
EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract        
Statutary tax rate     39.00% 39.00%
Total Income Tax Expense (Benefit)     28.80% 29.00%