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Income Taxes - Effective tax rate (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Effective Income Tax Rate Reconciliation, Percent        
Effective tax rate 32.50% 32.70% 32.40% 38.80%