RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 832	$ 589	$ 1,683	$ 1,173
Interest cost		937	672	1,907	1,334
Expected return on plan assets		(1,266)	(955)	(2,540)	(1,899)
Amortization of prior service cost		0	4	1	8
Amortization of net loss		555	464	1,130	917
Settlement charges (1)	[1]	0	0	0	0
Defined benefit plans		1,058	774	2,181	1,533
Multi-employer plans		234	224	461	417
Defined contribution plans		1,036	368	1,865	734
Total pension cost		2,328	1,366	4,507	2,684
Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		35	146	70	296
Interest cost		4,493	4,870	8,987	9,740
Expected return on plan assets		(6,915)	(7,671)	(13,831)	(15,342)
Amortization of prior service cost		0	0	0	0
Amortization of net loss		384	547	768	1,094
Settlement charges (1)	[1]	0	0	758	0
Defined benefit plans		(2,003)	(2,108)	(3,248)	(4,212)
Multi-employer plans		0	0	0	0
Defined contribution plans		5,610	5,436	11,504	11,834
Total pension cost		$ 3,607	$ 3,328	$ 8,256	$ 7,622

[1] Pension settlement charges resulting from a lump sum pension payment in the six months ended June 30, 2018.