RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Components of Pension Cost for Defined Benefit Plans) (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Pension Cost for Defined Benefit Plan
Settlement/curtailment loss		$ 1,696	$ 4,232	$ 758
Foreign Plan [Member]
Components of Pension Cost for Defined Benefit Plan
Service cost					$ 2,908	$ 3,252	$ 2,678
Interest cost					3,739	3,703	3,253
Expected return on plan assets					(4,430)	(5,057)	(4,270)
Amortization of prior service cost					58	1	15
Amortization of net loss					2,296	2,211	1,881
Settlement/curtailment loss	[1]				266	(397)	102
Pension cost for defined benefit plans					4,837	3,713	3,659
United States
Components of Pension Cost for Defined Benefit Plan
Service cost					140	139	608
Interest cost					18,610	18,084	19,497
Expected return on plan assets					(24,980)	(27,052)	(31,530)
Amortization of prior service cost					0	0	0
Amortization of net loss					1,654	1,498	2,133
Settlement/curtailment loss	[1]				0	6,686	8,150
Pension cost for defined benefit plans					$ (4,576)	$ (645)	$ (1,142)

[1] Pension settlement charges resulting from lump sum pension payments.