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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
INVESTMENTS |  |
Amortized Cost | $ 1,291,578 | $ 1,429,600
Fair Value | 1,289,388 | 1,423,757
Commercial paper | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 270,002 | 197,712
Fair Value | 270,000 | 197,710
Municipal securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 29,862 | 211,791
Fair Value | 29,833 | 211,239
U.S. government agency securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 153,356 | 109,697
Fair Value | 153,053 | 108,985
U.S. government agency securities | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 11,489 | 2,016
Fair Value | 11,477 | 2,013
Certificates of deposit | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 15,366 | 10,078
Fair Value | 15,366 | 10,078
U.S. treasuries | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 536,966 | 838,825
Fair Value | 535,741 | 834,302
U.S. treasuries | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 30,364 | 53,215
Fair Value | 30,338 | 53,164
Corporate bonds | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 233,328 | 0
Fair Value | 232,759 | 0
Corporate bonds | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 10,845 | 0
Fair Value | 10,821 | 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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