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Description of Business and Basis of Presentation Description of Business and Basis of Presentation - Narrative (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	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 495,072				$ 381,165				$ 495,072	$ 381,165	$ 162,591	$ 282,876
Net loss	$ 91,573	$ 87,743	$ 76,437	$ 68,524	$ 65,384	$ 45,179	$ 44,672	$ 37,414	$ 324,277	$ 192,649	$ 176,273

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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