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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Cash And Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | $ 535,160 | $ 630,010
Cash Equivalents, Gross Unrealized Gains |  | 6
Cash Equivalents, Gross Unrealized Losses | 3 | 4
Cash and Cash Equivalents, Fair Value Disclosure | 535,157 | 630,012
Cash Accounts in Banking Institutions [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 222,833 | 163,779
Cash and Cash Equivalents, Fair Value Disclosure | 222,833 | 163,779
Money Market Accounts [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 17,339 | 17,261
Cash and Cash Equivalents, Fair Value Disclosure | 17,339 | 17,261
U.S. Government Bonds [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 294,988 | 448,970
Cash Equivalents, Gross Unrealized Gains |  | 6
Cash Equivalents, Gross Unrealized Losses | 3 | 4
Cash and Cash Equivalents, Fair Value Disclosure | $ 294,985 | $ 448,972

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- Definition Fair value portion 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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