EMPLOYEE BENEFITS - Retirement and Post retirement costs - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Retirement expense for continuing operations
Net pension expense	$ 3,867	$ 10,727
Pension plan
Retirement expense for continuing operations
Interest cost	17,302	20,521
Expected return on plan assets	(20,209)	(21,502)
Special termination benefits		6,834
Actuarial loss	7,239	5,525
Net pension expense	4,332	11,378
Post-retirement plans
Retirement expense for continuing operations
Net pension expense	$ (465)	$ (651)