SEGMENT DISCLOSURE - Operating Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) property	Mar. 31, 2018 USD ($) property
Segment disclosure
Number of types of commercial real estate properties | property	2	2
Revenues	$ 47,277	$ 48,294
Expenses:
Interest expense	4,045	6,633
General and administrative	1,788	3,376
EXPENSES	132,917	47,284
Segment net operating income	291,941	1,010
Reportable segments
Expenses:
Segment net operating income	24,815	28,225
Reportable segments | Office (1)
Segment disclosure
Revenues	33,445	34,812
Expenses:
Operating	13,559	11,383
General and administrative	154	881
EXPENSES	13,713	12,264
Segment net operating income	19,732	22,548
Reportable segments | Hotel
Segment disclosure
Revenues	10,589	10,491
Expenses:
Operating	6,694	6,533
General and administrative	14	18
EXPENSES	6,708	6,551
Segment net operating income	3,881	3,940
Reportable segments | Lending
Segment disclosure
Revenues	2,924	2,991
Expenses:
Interest expense	582	184
Fees to related party	637	601
General and administrative	503	469
EXPENSES	1,722	1,254
Segment net operating income	$ 1,202	$ 1,737