INCOME TAXES - Statutory Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statutory rate
Statutory tax rate (as a percentage)		35.00%	35.00%	35.00%
Reconciliation
Statutory federal expense (35%)		$ 81,781	$ 65,023	$ 47,378
Statutory state income tax expense, net of federal tax benefit		7,594	6,714	4,611
Revaluation of deferred tax liabilities, net		(58,313)
Other		(9,235)	(267)	782
Income tax expense		$ 21,827	$ 71,470	$ 52,771
Forecast
Statutory rate
Statutory tax rate (as a percentage)	21.00%