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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
INVESTMENTS |  |
Amortized Cost | $ 1,426,842 | $ 1,429,600
Fair Value | 1,424,180 | 1,423,757
Commercial paper | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 296,708 | 197,712
Fair Value | 296,708 | 197,710
Municipal securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 129,779 | 211,791
Fair Value | 129,574 | 211,239
Corporate bonds | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 72,536 |
Fair Value | 72,429 |
Corporate bonds | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 1,753 |
Fair Value | 1,751 |
U.S. government agency securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 129,605 | 109,697
Fair Value | 129,308 | 108,985
U.S. government agency securities | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 10,432 | 2,016
Fair Value | 10,430 | 2,013
Certificates of deposit | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 12,630 | 10,078
Fair Value | 12,630 | 10,078
U.S. treasuries | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 744,403 | 838,825
Fair Value | 742,379 | 834,302
U.S. treasuries | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 28,996 | 53,215
Fair Value | $ 28,971 | 53,164
Variable rate demand notes | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost |  | 4,862
Fair Value |  | 4,862
Variable rate demand notes | Due 11 - 20 years |  |
INVESTMENTS |  |
Amortized Cost |  | 1,404
Fair Value |  | $ 1,404

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- Definition This item represents the cost of debt and equity securities net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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