REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 436,334	$ 298,119
Oil field services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Oil field services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	$ 436,334	$ 298,119