SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounting Policies [Abstract]
Total interest costs incurred	$ 13,736	$ 13,534
Interest capitalized	264	185
Interest expense	13,472	13,349
Cash paid for interest, net of amounts capitalized	15,043	13,301
Cash paid for income taxes	51	157
Accounts payable and accrued liabilities for construction in progress	16,541	12,838
Accrued leasing commissions	$ 2,083	$ 663