Income Taxes - Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Taxes [Line Items]
Total income before income taxes	$ (16,462)	$ 27,600	$ (34,805)	$ 98,346
Ireland
Income Taxes [Line Items]
Total income before income taxes	(18,314)	(5,340)	(34,203)	4,008
United States
Income Taxes [Line Items]
Total income before income taxes	1,773	29,627	(1,043)	96,288
France
Income Taxes [Line Items]
Total income before income taxes	$ 79	$ 3,313	$ 441	$ (1,950)