The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Income Taxes (Loss from Operations before Income Tax Expense by Jurisdiction) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net loss	$ (49,334)	$ (44,570)	$ (44,492)	$ (46,352)	$ (50,843)	$ (44,607)	$ (44,465)	$ (43,854)	$ (184,748)	$ (183,769)	$ (279,966)
Domestic Tax Authority [Member]
Net loss									(176,290)	(173,749)	(273,134)
Foreign Tax Authority [Member]
Net loss									$ (8,458)	$ (10,020)	$ (6,832)