SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Total interest costs incurred	$ 14,564	$ 13,736
Interest capitalized	559	264
Interest expense	14,005	13,472
Cash paid for interest, net of amounts capitalized	13,069	15,043
Cash paid for income taxes	71	51
Accounts payable and accrued liabilities for construction in progress	7,109	16,541
Accrued leasing commissions	$ 631	$ 2,083