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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 2,841,671  
Amortization 5,606 $ 5,064
Other current period change 11,892 15,742
Ending balance 2,858,815  
Currency Translation Adjustments and Other    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (140,438) (206,610)
Amortization 0 0
Other current period change 11,892 15,742
Ending balance (128,546) (190,868)
Net Actuarial Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (560,153) (620,292)
Amortization 5,517 5,011
Other current period change 0 0
Ending balance (554,636) (615,281)
Prior Service (Cost)/ Credit    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (6,910) (7,130)
Amortization 89 53
Other current period change 0 0
Ending balance (6,821) (7,077)
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (707,501) (834,032)
Ending balance $ (690,003) $ (813,226)