INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax asset:
Investment in SRII Opco, LP	$ 424,086	$ 269,846
59(e) capitalized IDC	53,814	0
NOL carryforward	29,866	101,337
Organizational/startup costs	144	154
Other	7	11
Total deferred tax assets	507,917	371,348
Less: valuation allowance	(507,917)	(371,348)
Net deferred tax assets	0	0
Deferred tax liability:
Deferred tax liability	0	0
Total net deferred tax assets/(liabilities)	$ 0	$ 0