BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rental and other property expenses	$ (20,253)	$ (17,916)
Rental and other property income	33,581	35,144
Interest and other income	3,892	3,461
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expense reimbursements		1,451
Non-lease component expense reimbursements		158
Rental and other property expenses		$ 104
Interest and other income	158
Reclassified From Expense Reimbursements | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rental and other property income	1,451
Reclassified From Rental And Other Property Expenses | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rental and other property income	$ 104