Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

REAL ESTATE INVESTMENTS - Purchase Price Allocation (Additional Information) (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 11, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 05, 2018
Business Acquisition [Line Items]
Outstanding principal balances on mortgage debt assumed		$ 313,812	$ 320,869
Repayments of mortgage debt assumed		$ 7,595	$ 122,180	$ 4,931
Mortgage Debt Assumed - at Fair Value
Business Acquisition [Line Items]
Repayments of mortgage debt assumed	$ 115,500
Four Tower Bridge \| Mortgage Debt Assumed - at Fair Value
Business Acquisition [Line Items]
Outstanding principal balances on mortgage debt assumed					$ 9,700