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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
INVESTMENTS |  |
Amortized Cost | $ 1,032,810 | $ 1,429,600
Fair Value | 1,032,036 | 1,423,757
Commercial paper | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 163,775 | 197,712
Fair Value | 163,774 | 197,710
Municipal securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 361 | 211,791
Fair Value | 361 | 211,239
U.S. government agency securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 116,524 | 109,697
Fair Value | 116,548 | 108,985
U.S. government agency securities | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 23,485 | 2,016
Fair Value | 23,531 | 2,013
Certificates of deposit | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 15,590 | 10,078
Fair Value | 15,590 | 10,078
U.S. treasuries | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 412,936 | 838,825
Fair Value | 412,057 | 834,302
U.S. treasuries | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 35,896 | 53,215
Fair Value | 35,967 | 53,164
Corporate bonds | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 247,340 | 0
Fair Value | 247,275 | 0
Corporate bonds | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 16,903 | 0
Fair Value | 16,933 | 0
Variable rate demand notes | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 0 | 4,862
Fair Value | 0 | 4,862
Variable rate demand notes | Due 11 - 20 years |  |
INVESTMENTS |  |
Amortized Cost | 0 | 1,404
Fair Value | $ 0 | $ 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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