BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Rent Receivable and Charges (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Deferred Rent Receivable and Charges
Deferred rent receivable	$ 63,252	$ 64,010
Deferred leasing costs	68,130	76,063
Deferred leasing costs, accumulated amortization	27,193	25,914
Deferred offering costs	2,306	2,060
Other deferred costs	$ 249	$ 135