LEASES AND RIGHT OF USE ASSETS (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended
	Jul. 31, 2019	Apr. 30, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Lease details
Noncancellable commitments for purchases of equipment			$ 29,200	$ 29,200
Lease rent expense			$ 30	100
Proceeds from obligation under finance lease	$ 2,300			$ 12,795	$ 0
Finance lease contract term	5 years
Initial monthly payment in sale-leaseback transaction	$ 30
Tractors
Lease details
Proceeds from obligation under finance lease		$ 10,500
Finance lease contract term		5 years
Initial monthly payment in sale-leaseback transaction		$ 100
Percentage of original cost at which Company has option to purchase at end of lease		32.50%