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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Total interest costs incurred			$ 26,808	$ 27,419
Interest capitalized			330	911
Interest expense	$ 13,129	$ 12,688	26,478	26,508
Cash paid for interest, net of amounts capitalized			26,574	26,926
Cash paid for income taxes			601	337
Accounts payable and accrued liabilities for construction in progress			12,245	8,156
Accrued leasing commissions			7,963	2,735
Reduction to capital for prepaid offering costs			$ 0	$ 236