Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 509	$ (13,821)
Effective tax rate	5.30%	(170.40%)
Unrecognized Tax Benefits	$ 5,300		$ 5,100
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 3,000		$ 2,800