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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ (813,226) $ (694,336)
Amortization 5,064 4,715
Other current period change 15,742 13,684
Ending balance (834,032) (712,735)
Currency Translation Adjustments and Other    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (190,868) (122,336)
Other current period change 15,742 13,684
Ending balance (206,610) (136,020)
Net Actuarial Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (615,281) (572,241)
Amortization 5,011 4,752
Other current period change 0 0
Ending balance (620,292) (576,993)
Prior Service (Cost)/ Credit    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (7,077) 241
Amortization 53 (37)
Other current period change 0 0
Ending balance $ (7,130) $ 278