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SUPPLEMENTAL CONDENSED CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Other Non-current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]    
Contingent income tax liabilities $ 26,356 $ 25,593
Deferred income taxes 3,492 3,170
Deferred cloud computing contract incentive 2,750 4,250
Other 10,006 11,415
Total other non-current liabilities 42,604 44,428
Accrued payroll taxes, CARES Act $ 2,900 $ 2,900