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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounting Policies [Abstract]
Total interest costs incurred			$ 26,977	$ 27,768
Interest capitalized			878	4,776
Interest expense	$ 13,153	$ 11,197	26,099	22,992
Cash paid for interest, net of amounts capitalized			24,076	20,480
Cash paid for income taxes			459	382
Accounts payable and accrued liabilities for construction in progress			(1,539)	(5,052)
Accrued leasing commissions			$ (7)	$ (448)