SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Total interest costs incurred	$ 27,768	$ 29,121
Interest capitalized	4,776	2,050
Interest expense	22,992	27,071
Cash paid for interest, net of amounts capitalized	20,480	25,244
Cash paid for income taxes	382	319
Accounts payable and accrued liabilities for construction in progress	(5,052)	656
Accrued leasing commissions	$ (448)	$ 154