Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 01, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
(Benefit from) provision for income taxes	$ 3,068	$ 3,221	$ (8,586)	$ 8,417
Effective income tax rate	26.60%	39.20%	(29.60%)	38.70%
Benefit recognized for excess tax benefits related to stock-based compensation	$ 1,300		$ 19,500
Unrecognized tax benefits	4,500		4,500			$ 4,100
Unrecognized tax benefits that would impact effective tax rate	$ 2,600		$ 2,600			2,400
ASU 2016-09
Operating Loss Carryforwards [Line Items]
Decrease to deferred tax assets					$ (7,900)
ASU 2016-09 | Retained Earnings
Operating Loss Carryforwards [Line Items]
Cumulative effect adjustment					$ (500)	$ 8,400