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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction Line Items      
Sales Revenue Services Net $ 2,273,062 $ 1,949,248 $ 1,643,704
Airmax [Member]      
Related Party Transaction Line Items      
Purchases from Related Party 600 400 1,100
Accounts Payable Due from Related Party 50    
Welltok      
Related Party Transaction Line Items      
Sales Revenue Services Net 1,500 $ 3,000 $ 5,300
Unisys [Member]      
Related Party Transaction Line Items      
Sales Revenue Services Net $ 400