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LONG-LIVED ASSETS (Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
LONG-LIVED ASSETS [Abstract]      
Land, buildings and improvements $ 1,239,696 $ 1,181,876  
Computer equipment and capitalized software 887,637 800,990  
Furniture and other equipment 424,363 380,174  
Construction in progress 151,830 176,275  
Property, Plant and Equipment, Gross, Total 2,703,526 2,539,315  
Less: accumulated depreciation 1,602,112 1,421,383  
Property, plant and equipment, net $ 1,101,414 $ 1,117,932 $ 946,593