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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
Total interest costs incurred			$ 40,892	$ 40,592
Interest capitalized			787	380
Interest expense	$ 13,302	$ 13,734	40,105	40,212
Cash paid for interest, net of amounts capitalized			41,547	39,375
Cash paid for income taxes			684	601
Accounts payable and accrued liabilities for construction in progress			14,421	16,025
Accrued leasing commissions			$ 989	$ 2,939