REVENUE Disaggregation of Revenue - Industry (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 1,895,282	$ 2,244,993		$ 4,425,320
SCS
Disaggregation of Revenue [Line Items]
Revenues	519,318	649,311	$ 1,147,765	1,284,982
Automotive | SCS
Disaggregation of Revenue [Line Items]
Revenues	147,749	261,288	397,674	514,967
Technology and healthcare | SCS
Disaggregation of Revenue [Line Items]
Revenues	84,766	110,054	175,899	223,723
Consumer package goods and retail | SCS
Disaggregation of Revenue [Line Items]
Revenues	236,499	225,582	466,431	442,679
Industrial and other | SCS
Disaggregation of Revenue [Line Items]
Revenues	$ 50,304	$ 52,387	$ 107,761	$ 103,613