REVENUE Disaggregation of Revenue - Geographical (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
United States
Disaggregation of Revenue [Line Items]
Revenues	1,703,799	1,988,488	$ 3,621,438	3,915,282
Canada
Disaggregation of Revenue [Line Items]
Revenues	97,536	124,473	216,882	242,794
Europe
Disaggregation of Revenue [Line Items]
Revenues	56,249	75,889	128,200	154,531
Mexico
Disaggregation of Revenue [Line Items]
Revenues	37,698	56,143	90,068	109,420
Singapore
Disaggregation of Revenue [Line Items]
Revenues		0	4,056,588	3,293
SCS
Disaggregation of Revenue [Line Items]
Revenues	519,318	649,311	1,147,765	1,284,982
Operating Segments | FMS
Disaggregation of Revenue [Line Items]
Revenues	1,198,177	1,390,910		2,742,509
Operating Segments | FMS | United States
Disaggregation of Revenue [Line Items]
Revenues	1,081,448	1,238,631	2,278,969	2,437,574
Operating Segments | FMS | Canada
Disaggregation of Revenue [Line Items]
Revenues	60,480	76,390	131,245	150,404
Operating Segments | FMS | Europe
Disaggregation of Revenue [Line Items]
Revenues	56,249	75,889	128,200	154,531
Operating Segments | FMS | Mexico
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Operating Segments | FMS | Singapore
Disaggregation of Revenue [Line Items]
Revenues		0	2,538,414	0
Operating Segments | SCS
Disaggregation of Revenue [Line Items]
Revenues	519,318	649,311		1,284,982
Operating Segments | SCS | United States
Disaggregation of Revenue [Line Items]
Revenues	441,332	539,623	963,857	1,069,016
Operating Segments | SCS | Canada
Disaggregation of Revenue [Line Items]
Revenues	40,288	53,545	93,840	103,253
Operating Segments | SCS | Europe
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Operating Segments | SCS | Mexico
Disaggregation of Revenue [Line Items]
Revenues	37,698	56,143	90,068	109,420
Operating Segments | SCS | Singapore
Disaggregation of Revenue [Line Items]
Revenues		0	1,147,765	3,293
Operating Segments | DTS
Disaggregation of Revenue [Line Items]
Revenues	293,944	362,244		711,865
Operating Segments | DTS | United States
Disaggregation of Revenue [Line Items]
Revenues	293,944	362,244	628,832	711,865
Operating Segments | DTS | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Operating Segments | DTS | Europe
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Operating Segments | DTS | Mexico
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Operating Segments | DTS | Singapore
Disaggregation of Revenue [Line Items]
Revenues		0	628,832	0
Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(116,157)	(157,472)		(314,036)
Eliminations | United States
Disaggregation of Revenue [Line Items]
Revenues	(112,925)	(152,010)	(250,220)	(303,173)
Eliminations | Canada
Disaggregation of Revenue [Line Items]
Revenues	(3,232)	(5,462)	(8,203)	(10,863)
Eliminations | Europe
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Eliminations | Mexico
Disaggregation of Revenue [Line Items]
Revenues	$ 0	0	0	0
Eliminations | Singapore
Disaggregation of Revenue [Line Items]
Revenues		$ 0	$ (258,423)	$ 0