SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Total interest costs incurred			$ 45,618	$ 40,892
Interest capitalized			2,029	787
Interest expense	$ 14,722	$ 13,302	43,589	40,105
Cash paid for interest, net of amounts capitalized			42,311	41,547
Cash paid for income taxes			289	684
Accounts payable and accrued liabilities for construction in progress			10,119	14,421
Accrued leasing commissions			$ 1,072	$ 989