Income Taxes - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Estimated annual effective tax rate	25.17%	27.50%	26.50%	27.50%
Effective tax rate	26.23%	32.92%	25.26%	31.28%