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OTHER LIABILITIES - NON CURRENT AND CURRENT OTHER LIABILITIES - NON CURRENT AND CURRENT (Schedule of other liabilities in statement of financial position) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - beginning balance $ 252,624 $ 273,792  
Total expense 28,213 27,758 $ 29,390
Net defined benefit liability (asset) - ending balance 275,950 252,624 $ 273,792
Unfunded Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - beginning balance 252,624    
Net defined benefit liability (asset) - ending balance 275,950 252,624  
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Transfers, new participants and funding of the plan 840 (231)  
Total expense 28,213 27,758  
Remeasurements (15,068) (14,735)  
Effect of changes in demographic assumptions (4,950) (2,600)  
Effect of changes in financial assumptions 14,110 (1,360)  
Effect of experience adjustments 5,908 18,695  
Translation differences 10,527 (41,783)  
Contributions paid $ (31,322) $ (21,647)