REAL ESTATE AND RELATED LEASE INTANGIBLES, NET (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Real estate held for sale	$ 49,022		$ 49,022		$ 0
Gross intangible assets	145,800		145,800		127,400
Accumulated amortization	31,800		31,800		19,900
Net intangible assets	114,000		114,000		107,500
Unamortized favorable/unfavorable lease intangibles	7,200		7,200		7,400
Adjustment against operating lease income for favorable/unfavorable leases	400	$ 400	1,200	$ 1,100
Unbilled rent receivables	5,000		5,000		3,000
Unencumbered real estates	60,900		60,900		$ 85,700
2015 Acquisitions
Business Acquisition [Line Items]
Revenue	$ 3,900		$ 7,900
2014 Acquisitions
Business Acquisition [Line Items]
Revenue		$ 900		$ 900