REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 229,125	$ 196,109	$ 616,132	$ 537,654
Sales Revenue | Customer Concentration Risk | One customer
Disaggregation of Revenue [Line Items]
Customer concentration	15.00%	19.00%	16.00%	17.00%
United States
Disaggregation of Revenue [Line Items]
Net sales	$ 221,501	$ 191,276	$ 591,147	$ 527,348
International
Disaggregation of Revenue [Line Items]
Net sales	7,624	4,833	24,985	10,306
Coolers & Equipment
Disaggregation of Revenue [Line Items]
Net sales	97,843	86,665	266,551	240,007
Drinkware
Disaggregation of Revenue [Line Items]
Net sales	126,368	104,049	334,278	280,703
Other
Disaggregation of Revenue [Line Items]
Net sales	4,914	5,395	15,303	16,944
Wholesale
Disaggregation of Revenue [Line Items]
Net sales	136,198	124,958	378,982	360,731
Direct-to-consumer
Disaggregation of Revenue [Line Items]
Net sales	$ 92,927	$ 71,151	$ 237,150	$ 176,923