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REVENUE - Disaggregation of Revenue by Industry (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Revenues $ 8,420,091 $ 8,925,801 $ 8,413,946
SCS      
Disaggregation of Revenue [Line Items]      
Revenues 2,544,420 2,551,271 2,398,144
SCS | Automotive      
Disaggregation of Revenue [Line Items]      
Revenues 940,314 1,003,508 947,408
SCS | Technology and healthcare      
Disaggregation of Revenue [Line Items]      
Revenues 386,610 432,107 480,026
SCS | Consumer packaged goods and retail      
Disaggregation of Revenue [Line Items]      
Revenues 993,403 901,344 766,765
SCS | Industrial and other      
Disaggregation of Revenue [Line Items]      
Revenues $ 224,093 $ 214,312 $ 203,945