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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 2,476,310 $ 2,536,568
Ending balance 2,150,558 2,476,987
Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (162,243) (199,704)
Amortization 0 0
Other current period change (33,871) (4,750)
Ending balance (196,114) (204,454)
Net Actuarial Loss and Prior Service Costs    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (667,459) (711,921)
Amortization 22,541 17,496
Other current period change (71,793) (7,203)
Ending balance (716,711) (701,628)
Unrealized Gain (Loss) from Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (6,789) (9)
Amortization 0 0
Other current period change (10,104) (9,063)
Ending balance (16,893) (9,072)
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (836,491) (911,634)
Amortization 22,541 17,496
Other current period change (115,768) (21,016)
Ending balance $ (929,718) $ (915,154)