Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Effective income tax rate differs from the statutory rate
Effective income tax rate (as a percent)	30.60%	31.50%	31.10%	30.20%
Reductions in tax positions relating to settlements with taxing authorities					$ 1,066