Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 258		$ (23,284)
(Loss) income before income taxes	$ 21,053		$ (42,871)
Effective income tax rate	1.20%	54.30%
Unrecognized tax benefits	$ 80,200	$ 90,300
Decrease in unrecognized tax benefits is reasonably possible	$ 8,000