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Income Taxes - Effective tax rate (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Effective Income Tax Rate Reconciliation, Percent        
Effective tax rate 32.80% 37.80% 38.80% 35.90%