FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Total	$ 722,186	$ 362,450
Money market funds
Available for sale securities, fair value	233,904	129,674
Certificates of deposit
Available for sale securities, fair value	309,162	157,243
U.S. treasuries and government agency bonds
Available for sale securities, fair value	99,012
Auction-rate securities backed by student-loan notes
Available for sale securities, fair value	25	49
Mutual funds and money market funds under deferred compensation plan
Available for sale securities, fair value	80,083	75,484
Level 1
Total	313,987	205,158
Level 1 | Money market funds
Available for sale securities, fair value	233,904	129,674
Level 1 | Certificates of deposit
Available for sale securities, fair value	0	0
Level 1 | U.S. treasuries and government agency bonds
Available for sale securities, fair value	0
Level 1 | Auction-rate securities backed by student-loan notes
Available for sale securities, fair value	0	0
Level 1 | Mutual funds and money market funds under deferred compensation plan
Available for sale securities, fair value	80,083	75,484
Level 2
Total	408,174	157,243
Level 2 | Money market funds
Available for sale securities, fair value	0	0
Level 2 | Certificates of deposit
Available for sale securities, fair value	309,162	157,243
Level 2 | U.S. treasuries and government agency bonds
Available for sale securities, fair value	99,012
Level 2 | Auction-rate securities backed by student-loan notes
Available for sale securities, fair value	0	0
Level 2 | Mutual funds and money market funds under deferred compensation plan
Available for sale securities, fair value	0	0
Level 3
Total	25	49
Level 3 | Money market funds
Available for sale securities, fair value	0	0
Level 3 | Certificates of deposit
Available for sale securities, fair value	0	0
Level 3 | U.S. treasuries and government agency bonds
Available for sale securities, fair value	0
Level 3 | Auction-rate securities backed by student-loan notes
Available for sale securities, fair value	25	49
Level 3 | Mutual funds and money market funds under deferred compensation plan
Available for sale securities, fair value	$ 0	$ 0