SUPPLEMENTAL CASH FLOW INFORMATION - Analysis of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 3,022,485	$ 3,158,058	$ 1,962,316
Short-term restricted cash	32,891	30,279	34,315
Long-term restricted cash	63,509	13,526	13,286
Cash, cash equivalents, and restricted cash	$ 3,118,885	$ 3,201,863	$ 2,009,917	$ 1,098,706

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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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-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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