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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Obligations and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in benefit obligations      
Service cost $ 3,286 $ 17,689 $ 19,933
Interest cost 22,750 23,578 36,002
Change in plan assets      
Balance at the beginning of year 599,085    
Balance at the end of year 681,732 599,085  
Foreign Pension Plan [Member]      
Change in benefit obligations      
Benefit obligations at beginning of year 79,972 76,824  
Service cost 2,678 2,215  
Interest cost 3,253 2,902  
Plan participants' contributions 176 148  
Acquisitions [1] 100,551 0  
Actuarial (gain) loss 4,926 7,671  
Benefits Paid (4,909) (2,306)  
Settlement/curtailment [2] (700) 0  
Currency translation 7,576 (7,482)  
Benefit obligations at end of year 193,523 79,972 76,824
Change in plan assets      
Balance at the beginning of year 70,341 73,917  
Actual return on plan assets 5,770 3,485  
Employer contributions 1,684 1,286  
Plan participants' contributions 176 148  
Acquisitions [1] 32,599 0  
Benefits paid (3,196) (1,840)  
Settlement [2] (22) 0  
Currency translation 5,992 (6,655)  
Balance at the end of year 113,344 70,341 73,917
Net amount recognized      
Funded status at end of year (80,179) (9,631)  
Unrecognized actuarial net loss 25,987 24,476  
Unrecognized prior service cost (11) (18)  
Unrecognized transition assets, net 35 37  
Net amount recognized in the balance sheets (54,168) 14,864  
United States Pension Plan of US Entity [Member]      
Change in benefit obligations      
Benefit obligations at beginning of year 484,758 481,345  
Service cost 608 15,474  
Interest cost 19,497 20,676  
Plan participants' contributions 0 0  
Acquisitions [1] 0 0  
Actuarial (gain) loss 46,144 20,333  
Benefits Paid (6,409) (29,002)  
Settlement/curtailment [2] (37,523) (24,068)  
Currency translation 0 0  
Benefit obligations at end of year 507,075 484,758 481,345
Change in plan assets      
Balance at the beginning of year 528,744 502,184  
Actual return on plan assets 82,732 34,779  
Employer contributions 55 20,087  
Plan participants' contributions 0 0  
Acquisitions [1] 0 0  
Benefits paid (5,620) (28,306)  
Settlement [2] (37,523) 0  
Currency translation 0 0  
Balance at the end of year 568,388 528,744 $ 502,184
Net amount recognized      
Funded status at end of year 61,313 43,986  
Unrecognized actuarial net loss 90,679 122,109  
Unrecognized prior service cost 0 0  
Unrecognized transition assets, net 0 0  
Net amount recognized in the balance sheets $ 151,992 $ 166,095  
[1] Acquisitions in 2017 relate to acquisition of Air Liquide Welding as discussed in Note 3 to the consolidated financial statements.
[2] Settlements in 2017 resulting from lump sum pension payments.