INCOME TAXES - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Non-current Deferred Tax Asset (Liability)
Accumulated net operating losses of TRS	$ 263	$ 337
Unrealized gain (loss)	245	251
Capitalized transaction costs	112	122
Deferred income	0	57
AMT Credit	0	19
Deferred tax asset	620	786
Valuation allowance	0	(767)
Net non-current deferred tax asset (liability)	$ 620	$ 19