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STOCK BASED COMPENSATION - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Stock Based Compensation
Compensation expenses	$ 2.2	$ 4.3	$ 4.0	$ 8.3
Restricted Stock Units (RSUs)
Stock Based Compensation
Vesting period (in years)			3 years
Restricted Stock Units (RSUs) \| First anniversary of the grant date
Stock Based Compensation
Vest percentage			0.33%
Restricted Stock Units (RSUs) \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vest percentage			0.16%
Restricted Stock Units (RSUs) \| Various employees
Stock Based Compensation
Options granted (in shares)	12,965		153,590
Restricted Stock Units (RSUs) \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)	8,266		9,237
Deferred Stock Units
Stock Based Compensation
Other than options granted (in shares)			9,000
Vesting period (in years)			1 year
Deferred Stock Units \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)	8,266		8,965
Restricted Stock Awards (RSAs)
Stock Based Compensation
Vesting period (in years)			3 years
Restricted Stock Awards (RSAs) \| First anniversary of the grant date
Stock Based Compensation
Vest percentage			0.33%
Restricted Stock Awards (RSAs) \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vest percentage			0.16%
Restricted Stock Awards (RSAs) \| Various employees
Stock Based Compensation
Options granted (in shares)			193,636
Performance-Based Restricted Stock Awards
Stock Based Compensation
Other than options granted (in shares)			166,000
Performance-Based Restricted Stock Awards \| Various employees
Stock Based Compensation
Options granted (in shares)			165,973
Stock Options
Stock Based Compensation
Options granted (in shares)			0
Vesting period (in years)			3 years
Stock Options \| First anniversary of the grant date
Stock Based Compensation
Vest percentage			0.33%
Stock Options \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vest percentage			0.16%
2018 Plan
Stock Based Compensation
Shares authorized to be awarded (in shares)	4,800,000		4,800,000
2012 Plan
Stock Based Compensation
Shares authorized to be awarded (in shares)	8,800,000		8,800,000