FAIR VALUE DISCLOSURES - Schedule of Face Value, Carrying Amounts and Fair Value (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Face Value	$ 480,572,000	$ 453,334,000
Series A Debentures | Pacific Oak SOR (BVI) Holdings, Ltd. Series A Debentures | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Face Value	168,039,000	224,746,000
Series B Debentures | Pacific Oak SOR (BVI) Holdings, Ltd. Series B Debentures | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Face Value	73,335,000	0
Carrying Amount | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Value	479,487,000	451,743,000
Carrying Amount | Series A Debentures | Pacific Oak SOR (BVI) Holdings, Ltd. Series A Debentures | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Value	169,369,000	221,920,000
Carrying Amount | Series B Debentures | Pacific Oak SOR (BVI) Holdings, Ltd. Series B Debentures | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Value	67,847,000	0
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Value	481,617,000	455,849,000
Fair Value | Series A Debentures | Pacific Oak SOR (BVI) Holdings, Ltd. Series A Debentures | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Value	142,133,000	229,877,000
Fair Value | Series B Debentures | Pacific Oak SOR (BVI) Holdings, Ltd. Series B Debentures | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and bond payable, Value	$ 55,994,000	$ 0