REAL ESTATE (Operating Leases) (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) tenant	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Deferred rent recognized	$ 13,943	$ 13,319
Deferred rent receivables	54,600		$ 38,700
Incentive to Lessee	$ 4,700		3,300
Number of tenants | tenant	900
Maximum [Member]
Operating Leased Assets [Line Items]
Operating lease, term	14 years
Weighted Average [Member]
Operating Leased Assets [Line Items]
Operating lease, term	4 years 10 months 24 days
Other Liabilities [Member]
Operating Leased Assets [Line Items]
Security deposit liability	$ 12,700		$ 12,200