ACCOUNTS RECEIVABLE (SCHEDULE OF ACCOUNTS RECEIVABLE) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Accounts receivable	$ 362,719	$ 383,464
Less: Allowance for credit losses	(5,409)	(5,067)	$ (5,452)	$ (5,592)
Accounts Receivable, Net, Current, Total	$ 357,310	$ 378,397