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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Total interest costs incurred			$ 41,305	$ 43,912
Interest capitalized			7,055	3,516
Interest expense	$ 11,258	$ 13,325	34,250	40,396
Cash paid for interest, net of amounts capitalized			30,562	37,557
Cash paid for income taxes			382	319
Accounts payable and accrued liabilities for construction in progress			(9,092)	8,982
Accrued leasing commissions			$ (431)	$ (124)