RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Obligations and Funded Status) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets
Balance at the beginning of year		$ 612,265
Balance at the end of year		695,224	$ 612,265
United States
Change in benefit obligations
Benefit obligations at beginning of year		438,945	507,075
Service cost		140	139	$ 608
Interest cost		18,610	18,084	19,497
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		0	0
Acquisitions		0	0
Actuarial (gain) loss		58,842	(46,924)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(24,026)	(7,973)
Settlement/curtailment	[1]	0	(31,456)
Currency translation		0	0
Benefit obligations at end of year		492,511	438,945	507,075
Change in plan assets
Balance at the beginning of year		512,078	568,388
Actual return on plan assets		100,744	(23,012)
Employer contributions		0	690
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		0	0
Acquisitions		0	0
Benefits paid		(23,271)	(7,047)
Settlement	[1]	0	(26,941)
Currency translation		0	0
Balance at the end of year		589,551	512,078	568,388
Net amount recognized
Funded status at end of year		97,040	73,133
Unrecognized actuarial net loss		67,050	85,624
Unrecognized prior service cost		0	0
Unrecognized transition assets, net		0	0
Net amount recognized in the balance sheets		164,090	158,757
Foreign Plan [Member]
Change in benefit obligations
Benefit obligations at beginning of year		168,811	193,523
Service cost		2,908	3,252	2,678
Interest cost		3,739	3,703	3,253
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		153	196
Acquisitions		(1,864)	(5,322)
Actuarial (gain) loss		10,653	(5,674)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(8,961)	(9,723)
Settlement/curtailment	[1]	(1,256)	(1,886)
Currency translation		2,675	(9,258)
Benefit obligations at end of year		176,858	168,811	193,523
Change in plan assets
Balance at the beginning of year		100,187	113,344
Actual return on plan assets		9,743	(2,855)
Employer contributions		2,210	2,087
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		153	196
Acquisitions		(2,651)	586
Benefits paid		(6,120)	(5,904)
Settlement	[1]	(920)	(1,455)
Currency translation		3,071	(5,812)
Balance at the end of year		105,673	100,187	$ 113,344
Net amount recognized
Funded status at end of year		(71,185)	(68,624)
Unrecognized actuarial net loss		28,543	25,581
Unrecognized prior service cost		457	534
Unrecognized transition assets, net		30	32
Net amount recognized in the balance sheets		$ (42,155)	$ (42,477)

[1] Settlements in 2018 resulting from lump sum pension payments.