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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Cash equivalents	$ 365,589	$ 980,580
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	365,589	980,580
Restricted cash	6,369	4,352
Liabilities:
Interest rate collar	11,527	16,908
Fair Value, Measurements, Recurring | Quoted Market Prices in Active Markets (Level 1)
Assets:
Cash equivalents	0	504,980
Restricted cash	4,631	2,054
Liabilities:
Interest rate collar	0	0
Fair Value, Measurements, Recurring | Other Observable Inputs (Level 2)
Assets:
Cash equivalents	365,589	475,600
Restricted cash	1,738	2,298
Liabilities:
Interest rate collar	11,527	16,908
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Restricted cash	0	0
Liabilities:
Interest rate collar	$ 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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