OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Accrued taxes other than income	$ 6,974	$ 689
Accrued operations and maintenance expense	1,339	1,520
Accrued incentive compensation	733	1,425
Accrued professional and consulting fees	692	158
Accrued capital costs	686	17,035
Accrued finance lease liability	0	1,989
Other	1,517	1,109
Total other current liabilities	$ 11,941	$ 23,925
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent