FAIR VALUE MEASUREMENTS (Estimated Fair Values of the Financial Assets and Liabilities not Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial Liabilities:
Short-term debt	$ 7,790	$ 16,018
Recurring | Balance
Financial Assets:
Cash equivalents:	262,515	78,302
Restricted cash	2,053	2,722
Employee loans	2,820	818
Financial Liabilities:
Short-term debt	6,139	16,018
Other long-term debt	4,849	5,234
Recurring | Balance | Time Deposits
Financial Assets:
Time deposits included in Short-term investments	60,216
Recurring | Balance | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Recurring | Balance | Money market funds
Financial Assets:
Cash equivalents:	262,515	78,302
Recurring | Estimated Fair Value
Financial Assets:
Cash equivalents:	262,515	78,302
Restricted cash	2,053	2,722
Employee loans	2,820	818
Financial Liabilities:
Short-term debt	6,139	16,018
Other long-term debt	4,849	5,234
Recurring | Estimated Fair Value | Time Deposits
Financial Assets:
Time deposits included in Short-term investments	60,216
Recurring | Estimated Fair Value | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Recurring | Estimated Fair Value | Money market funds
Financial Assets:
Cash equivalents:	262,515	78,302
Recurring | Estimated Fair Value | Level 1
Financial Assets:
Cash equivalents:	262,515	78,302
Restricted cash	2,053	2,722
Employee loans	0	0
Financial Liabilities:
Short-term debt	0	0
Other long-term debt	0	0
Recurring | Estimated Fair Value | Level 1 | Time Deposits
Financial Assets:
Time deposits included in Short-term investments	0
Recurring | Estimated Fair Value | Level 1 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	0	0
Recurring | Estimated Fair Value | Level 1 | Money market funds
Financial Assets:
Cash equivalents:	262,515	78,302
Recurring | Estimated Fair Value | Level 2
Financial Assets:
Cash equivalents:	0	0
Restricted cash	0	0
Employee loans	0	0
Financial Liabilities:
Short-term debt	6,139	16,018
Other long-term debt	4,849	5,234
Recurring | Estimated Fair Value | Level 2 | Time Deposits
Financial Assets:
Time deposits included in Short-term investments	60,216
Recurring | Estimated Fair Value | Level 2 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Recurring | Estimated Fair Value | Level 2 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Recurring | Estimated Fair Value | Level 3
Financial Assets:
Cash equivalents:	0	0
Restricted cash	0	0
Employee loans	2,820	818
Financial Liabilities:
Short-term debt	0	0
Other long-term debt	0	0
Recurring | Estimated Fair Value | Level 3 | Time Deposits
Financial Assets:
Time deposits included in Short-term investments	0
Recurring | Estimated Fair Value | Level 3 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	0	0
Recurring | Estimated Fair Value | Level 3 | Money market funds
Financial Assets:
Cash equivalents:	$ 0	$ 0