EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Amortization of:
Net pension expense	$ 13,357	$ 12,842
Contribution to pension plans	3,700
Estimated total contributions	23,700
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	3,249	3,400
Interest cost	21,489	22,240
Expected return on plan assets	(22,478)	(23,085)
Amortization of:
Net actuarial loss	8,450	7,965
Prior service cost	145	0
Net pension expense	10,855	10,520
Union-administered plans
Amortization of:
Net pension expense	2,502	2,322
Company-administered plans
Amortization of:
Net pension expense	10,855	10,520
U.S.
Amortization of:
Net pension expense	11,311	11,175
Non-U.S.
Amortization of:
Net pension expense	$ (456)	$ (655)