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BASIS OF PRESENTATION - Narrative (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) segment	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of reportable segments | segment	3
Increase in allowable interest deduction, COVID-19		$ 179,400
Deferred payment of certain employment taxes, COVID-19		29,300
Refundable payroll tax credit, COVID-19	$ 12,400
Cash and cash equivalents	$ 583,341	$ 720,662

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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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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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