RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Foreign Plan [Member]
Retirement Annuity and Guaranteed Continuous Employment Plans
Assets for Plan Benefits, Defined Benefit Plan	[1]	$ 0	$ 77
Accrued pension liability, current	[2]	(2,847)	(2,996)
Accrued pension liability, long-term	[3]	(68,338)	(65,705)
Accumulated other comprehensive loss, excluding tax effects		29,030	26,147
Net amount recognized in the balance sheets		(42,155)	(42,477)
United States
Retirement Annuity and Guaranteed Continuous Employment Plans
Assets for Plan Benefits, Defined Benefit Plan	[1]	111,879	87,786
Accrued pension liability, current	[2]	(739)	(786)
Accrued pension liability, long-term	[3]	(14,100)	(13,867)
Accumulated other comprehensive loss, excluding tax effects		67,050	85,624
Net amount recognized in the balance sheets		$ 164,090	$ 158,757

[1] Included in Other assets.

[2] Included in Other current liabilities.

[3] Included in Other liabilities.