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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
INVESTMENTS |  |
Amortized Cost | $ 1,429,600 | $ 1,850,101
Fair Value | 1,423,757 | 1,849,146
Commercial paper | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 197,712 | 334,077
Fair Value | 197,710 | 334,077
Municipal securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 211,791 | 666
Fair Value | 211,239 | 666
U.S. government agency securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 109,697 | 62,687
Fair Value | 108,985 | 62,661
U.S. government agency securities | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 2,016 | 12,500
Fair Value | 2,013 | 12,476
Certificates of deposit | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 10,078 | 44,502
Fair Value | 10,078 | 44,502
U.S. treasuries | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 838,825 | 1,308,536
Fair Value | 834,302 | 1,307,821
U.S. treasuries | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 53,215 | 87,133
Fair Value | 53,164 | $ 86,943
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 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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