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Consolidated Statements of Cash Flows - Supplemental Cash Flow Information - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 1,604,869	$ 1,869,577	$ 606,166
Current portion of restricted cash included in other current assets	11,135	7,090	10,887
Non-current portion of restricted cash included in other assets	9,691	9,946	10,551
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,625,695	$ 1,886,613	$ 627,604

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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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