Income Taxes - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Estimated annual effective tax rate	26.93%	27.50%	27.25%	27.50%
Effective tax rate	26.40%	31.30%	24.86%	30.51%