Income Taxes - Components of loss before income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Loss before income taxes	$ (241,677)	$ (226,085)	$ (271,711)
Cayman Islands
Income Taxes
Loss before income taxes	11,779	14,838	(163,770)
United States
Income Taxes
Loss before income taxes	(99,225)	(69,695)	(33,374)
Ireland
Income Taxes
Loss before income taxes	(154,217)	(171,134)	(74,472)
United Kingdom
Income Taxes
Loss before income taxes	$ (14)	$ (94)	$ (95)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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