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REVENUE Disaggregation of Revenue - Industry (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 1,903,467 $ 1,736,983
SCS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 494,707 451,613
Automotive | SCS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 207,792 196,441
Technology and healthcare | SCS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 103,097 82,658
CPG and retail | SCS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 135,358 118,949
Industrial and other | SCS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 48,460 $ 53,565