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ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2018
Entity Wide Revenue Major Customer Line Items          
Revenue. $ 566,734 $ 492,980 $ 1,660,747 $ 1,378,274  
Sears          
Entity Wide Revenue Major Customer Line Items          
Accounts receivable amount from major customer $ 2,700   2,700   $ 2,700
Revenue | Customer Concentration Risk | Minimum          
Entity Wide Revenue Major Customer Line Items          
Revenue.     $ 100,000    
Revenue | Customer Concentration Risk | Financial Services Client          
Entity Wide Revenue Major Customer Line Items          
Concentration Risk, Customer     one    
Concentration risk percentage     13.30% 11.80%