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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Total interest costs incurred			$ 40,368	$ 41,305
Interest capitalized			1,220	7,055
Interest expense	$ 13,049	$ 11,258	39,148	34,250
Cash paid for interest, net of amounts capitalized			36,070	30,562
Cash paid for income taxes			459	382
Accounts payable and accrued liabilities for construction in progress			(471)	(9,092)
Accrued leasing commissions			$ 275	$ (431)