Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

	Three Months Ended						Nine Months Ended
	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
	(in thousands, except percentages)
Provision for (benefit from) income taxes	$	(24,025	)	$	(13,353	)	$	29,754		$	(19,421	)
Effective tax rate	(6		)%	(11		)%	3		%	(5		)%