EMPLOYEE BENEFITS - Retirement and Post retirement costs - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Retirement expense for continuing operations
Net pension expense	$ 10,727	$ 2,778
Pension plan
Retirement expense for continuing operations
Interest cost	20,521	19,788
Expected return on plan assets	(21,502)	(22,624)
Special termination benefits	6,834
Actuarial loss	5,525	6,295
Net pension expense	11,378	3,459
Post-retirement plans
Retirement expense for continuing operations
Net pension expense	$ (651)	$ (681)