SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Total interest costs incurred	$ 13,702	$ 13,489
Interest capitalized	371	543
Interest expense	13,331	12,946
Cash paid for interest, net of amounts capitalized	10,708	11,906
Cash paid for income taxes	46	75
Accounts payable and accrued liabilities for construction in progress	577	171
Accrued leasing commissions	$ 193	$ 251