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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
INVESTMENTS |  |
Amortized Cost | $ 1,482,934 | $ 1,429,600
Fair Value | 1,479,487 | 1,423,757
Commercial paper | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 329,770 | 197,712
Fair Value | 329,768 | 197,710
Municipal securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 59,158 | 211,791
Fair Value | 59,033 | 211,239
U.S. government agency securities | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 152,071 | 109,697
Fair Value | 151,582 | 108,985
U.S. government agency securities | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 2,580 | 2,016
Fair Value | 2,571 | 2,013
Certificates of deposit | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 15,161 | 10,078
Fair Value | 15,161 | 10,078
U.S. treasuries | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 705,370 | 838,825
Fair Value | 703,399 | 834,302
U.S. treasuries | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 39,011 | 53,215
Fair Value | 38,702 | 53,164
Corporate bonds | Less than 1 year |  |
INVESTMENTS |  |
Amortized Cost | 158,748 | 0
Fair Value | 158,296 | 0
Corporate bonds | Due 1 - 10 years |  |
INVESTMENTS |  |
Amortized Cost | 21,065 | 0
Fair Value | 20,975 | 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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