Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Entity Wide Revenue Major Customer Line Items
Revenue.	$ 2,273,062	$ 1,949,248	$ 1,643,704
Customer Concentration Risk \| Minimum
Entity Wide Revenue Major Customer Line Items
Revenue.	$ 100,000
Revenue \| Customer Concentration Risk
Entity Wide Revenue Major Customer Line Items
Concentration Risk, Customer	one	no
Revenue \| Customer Concentration Risk \| Financial Services Client
Entity Wide Revenue Major Customer Line Items
Concentration risk percentage	12.00%	13.00%	3.00%