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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Shareholders' equity $ 2,279,687 $ 2,255,557 $ 2,242,736 $ 2,476,310
Cumulative translation adjustments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Shareholders' equity (140,302)   (237,013)  
Net actuarial loss and prior service cost        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Shareholders' equity (649,542)   (661,293)  
Unrealized gain (loss) from cash flow hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Shareholders' equity (12,923)   (16,639)  
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Shareholders' equity $ (802,767) $ (817,205) $ (914,945) $ (836,491)