SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Financing Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Unamortized deferred financing costs	$ 3,433	$ 16,148
Amortization expense	5,476	7,000	$ 6,120
Accumulated amortization	7,354	17,175
Reorganization Items
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Unamortized deferred financing costs	16,779
Intangible Lease Assets And Other Assets
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Unamortized deferred financing costs		9,062
Mortgage and Other Indebtedness, Net
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Unamortized deferred financing costs	$ 3,433	$ 16,148