SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplement Disclosures Related to Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Total interest costs incurred	$ 14,128	$ 14,467
Interest capitalized	2,333	835
Interest expense	11,795	13,632
Cash paid for interest, net of amounts capitalized	10,459	12,724
Cash paid for income taxes	50	0
Accounts payable and accrued liabilities for construction in progress	205	(890)
Accrued leasing commissions	$ (166)	$ (630)