SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Total interest costs incurred			$ 30,092	$ 27,327
Interest capitalized			1,225	524
Interest expense	$ 14,862	$ 13,331	28,867	26,803
Cash paid for interest, net of amounts capitalized			22,093	26,918
Cash paid for income taxes			222	554
Accounts payable and accrued liabilities for construction in progress			9,695	18,141
Accrued leasing commissions			$ 972	$ 1,913