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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (supplemental cash flow information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents $ 40,435 $ 41,231 $ 123,122  
Restricted cash and restricted cash equivalents included in funds held for customers $ 294,165 $ 241,488 $ 106,287  
Restricted cash and restricted cash equivalents included in funds held for customers [Extensible Enumeration] Funds held for customers, including securities carried at fair value of $8,126 and $13,307, respectively Funds held for customers, including securities carried at fair value of $8,126 and $13,307, respectively Funds held for customers, including securities carried at fair value of $8,126 and $13,307, respectively  
Non-current restricted cash included in other non-current assets $ 2,815 $ 2,772 $ 0  
Non-current restricted cash included in other non-current assets [Extensible Enumeration] Other non-current assets Other non-current assets Other non-current assets  
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 337,415 $ 285,491 $ 229,409 $ 174,811
Interest paid 87,108 46,621 22,853  
Income taxes paid 38,629 18,761 24,701  
Non-cash consideration for customer list purchases [1] 5,096 15,528 21,439  
Liabilities for holdback payments on asset purchases and acquisitions 8,609 4,121 12,949  
Restricted stock units [Member]        
Vesting of restricted stock unit awards $ 13,602 $ 16,646 $ 7,839  
[1] Consists of pre-acquisition amounts owed to us by the sellers.