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Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Cash equivalents	$ 980,580	$ 1,086,402
Restricted cash	4,352	6,388
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	980,580	1,086,402
Restricted cash	4,352	6,388
Liabilities:
Derivative Liability	16,908	3,847
Fair Value, Measurements, Recurring | Quoted Market Prices in Active Markets (Level 1)
Assets:
Cash equivalents	504,980	0
Restricted cash	2,054	2,048
Liabilities:
Derivative Liability	0	0
Fair Value, Measurements, Recurring | Other Observable Inputs (Level 2)
Assets:
Cash equivalents	475,600	1,086,402
Restricted cash	2,298	4,340
Liabilities:
Derivative Liability	16,908	3,847
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets:
Cash equivalents	0	0
Restricted cash	0	0
Liabilities:
Derivative Liability	$ 0	$ 0

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Amount of 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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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

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