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Restructuring And Liability Management (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
Workforce reduction		13.00%		10.00%
Reduction in workforce	$ 1,460	$ 4,611
Liability management	29,387	0
Total restructuring and liability management expenses	$ 30,847	$ 4,611	$ 0

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Liability Management

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Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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