FAIR VALUE MEASUREMENTS (Estimated Fair Values of the Financial Assets and Liabilities not Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Balance
Financial Assets:
Cash equivalents:	$ 325,694	$ 273,330
Financial Liabilities:
Deferred consideration for asset acquisition	45,820	46,954
Balance | Time deposits
Financial Assets:
Time deposits included in Short-term investments	61,625	60,739
Balance | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Balance | Money market funds
Financial Assets:
Cash equivalents:	127,993	168,120
Balance | Time deposits
Financial Assets:
Cash equivalents:	197,701	105,210
Estimated Fair Value
Financial Assets:
Cash equivalents:	325,694	273,330
Financial Liabilities:
Deferred consideration for asset acquisition	45,820	46,954
Estimated Fair Value | Time deposits
Financial Assets:
Time deposits included in Short-term investments	61,625	60,739
Estimated Fair Value | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Estimated Fair Value | Money market funds
Financial Assets:
Cash equivalents:	127,993	168,120
Estimated Fair Value | Time deposits
Financial Assets:
Cash equivalents:	197,701	105,210
Estimated Fair Value | Level 1
Financial Assets:
Cash equivalents:	127,993	168,120
Financial Liabilities:
Deferred consideration for asset acquisition	0	0
Estimated Fair Value | Level 1 | Time deposits
Financial Assets:
Time deposits included in Short-term investments	0	0
Estimated Fair Value | Level 1 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	0	0
Estimated Fair Value | Level 1 | Money market funds
Financial Assets:
Cash equivalents:	127,993	168,120
Estimated Fair Value | Level 1 | Time deposits
Financial Assets:
Cash equivalents:	0	0
Estimated Fair Value | Level 2
Financial Assets:
Cash equivalents:	197,701	105,210
Financial Liabilities:
Deferred consideration for asset acquisition	45,820	46,954
Estimated Fair Value | Level 2 | Time deposits
Financial Assets:
Time deposits included in Short-term investments	61,625	60,739
Estimated Fair Value | Level 2 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Estimated Fair Value | Level 2 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Estimated Fair Value | Level 2 | Time deposits
Financial Assets:
Cash equivalents:	197,701	105,210
Estimated Fair Value | Level 3
Financial Assets:
Cash equivalents:	0	0
Financial Liabilities:
Deferred consideration for asset acquisition	0	0
Estimated Fair Value | Level 3 | Time deposits
Financial Assets:
Time deposits included in Short-term investments	0	0
Estimated Fair Value | Level 3 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	0	0
Estimated Fair Value | Level 3 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Estimated Fair Value | Level 3 | Time deposits
Financial Assets:
Cash equivalents:	$ 0	$ 0