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OTHER LONG TERM LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract]    
Deferred revenue - long-term $ 21,158 $ 17,434
Deferred Compensation Liability, Classified, Noncurrent 28,221 23,858
Deferred social security taxes 16,983 15,986
Other Accrued Liabilities, Noncurrent 30,557 38,907
Other Liabilities, Noncurrent, Total $ 96,919 $ 96,185