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OTHER LIABILITIES - NON CURRENT AND CURRENT (Schedule of other liabilities in statement of financial position) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - beginning balance $ 275,950 $ 252,624  
Total expense 29,862 28,213 $ 27,758
Net defined benefit liability (asset) - ending balance 312,293 275,950 $ 252,624
Unfunded Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - beginning balance 275,950    
Net defined benefit liability (asset) - ending balance 312,293 275,950  
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Transfers, new participants and funding of the plan (3,177) 840  
Total expense 29,862 28,213  
Remeasurements 38,263 15,068  
Effect of changes in demographic assumptions 22,575 (4,950)  
Effect of changes in financial assumptions 2,272 14,110  
Effect of experience adjustments 13,416 5,908  
Translation differences (283) 10,527  
Contributions paid $ (28,322) $ (31,322)