EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amortization of:
Contribution to pension plans			$ 23,000
Expected plan contributions	$ 27,000		27,000
Pension Benefits
Amortization of:
Net pension expense	7,056	$ 18,294	20,748	$ 44,201
Company Administered Plan | Pension Benefits
Components of net periodic benefit cost
Service cost	3,074	3,165	9,370	9,431
Interest cost	19,425	21,609	58,275	64,524
Expected return on plan assets	(25,187)	(22,822)	(76,086)	(68,012)
Amortization of:
Net actuarial loss	7,130	8,336	21,416	24,863
Prior service cost	145	133	434	399
Net pension expense	4,587	10,421	13,409	31,205
Union Administered Plan | Pension Benefits
Amortization of:
Net pension expense	2,469	7,873	7,339	12,996
U.S. | Company Administered Plan | Pension Benefits
Amortization of:
Net pension expense	7,011	10,929	21,033	32,787
Non-U.S. | Company Administered Plan | Pension Benefits
Amortization of:
Net pension expense	$ (2,424)	$ (508)	$ (7,624)	$ (1,582)