REVENUES - General Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Sep. 30, 2022	Oct. 01, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Payroll taxes, bonuses and employee benefit costs for all Company personnel	$ 20,373	$ 19,374	$ 60,169	$ 57,530
Revenue of the entity recorded in which it acts solely in the capacity of an agent			0
Retained accounts receivable	$ 7,700		$ 7,700
Accounts receivable
Disaggregation of Revenue [Line Items]
Retained accounts receivable					$ 4,500
Maximum [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue (as a percent)	3.00%		3.00%
Minimum [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue (as a percent)	2.00%		2.00%
Cost of Sales [Member]
Disaggregation of Revenue [Line Items]
Payroll taxes, bonuses and employee benefit costs for all Company personnel			$ 0
Allocation of facilities costs to contract revenue			$ 0