Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. - Federal	$ 0	$ 0	$ 18,064
U.S. - State	97	330	331
France	0	0	265
Total current	97	330	18,660
Deferred:
Ireland	(1,256)	0	0
U.S. - Federal	(4,093)	(19,503)	4,686
U.S. - State	(104)	1,280	1,043
Total deferred	(5,453)	(18,223)	5,729
Income tax (benefit) provision	$ (5,356)	$ (17,893)	$ 24,389