INCOME TAXES - NARRATIVE (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Effective Income Tax Rate Reconciliation, Percent	19.20%	21.30%
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 5,026
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense				$ 32,500
Tax Cuts and Jobs Act of 2017, measurement period adjustment, income tax expense (benefit)			$ 19,500