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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Shareholders' equity $ 2,418,214 $ 2,279,687 $ 2,255,557 $ 2,159,092 $ 2,242,736 $ 2,476,310
Cumulative translation adjustments            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Shareholders' equity (132,115)     (228,121)    
Net actuarial loss and prior service cost            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Shareholders' equity (644,008)     (658,866)    
Unrealized gain (loss) from cash flow hedges            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Shareholders' equity (11,559)     (17,653)    
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Shareholders' equity $ (787,682) $ (802,767) $ (817,205) $ (904,640) $ (914,945) $ (836,491)