INTANGIBLES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible assets and liabilities
Amortization/accretion of intangible assets and liabilities	$ 6,100	$ 10,300	$ 1,800
Estimated future amortization
2017	4,900
2018	4,500
2019	3,200
2020	1,600
Thereafter	16,900
Leases, Acquired-in-Place
Intangible assets and liabilities
Gross Assets	37,567	39,129
Accumulated Amortization	(21,552)	(16,990)
Net Carrying Amount	16,015	22,139
Tenant Leases above Market
Intangible assets and liabilities
Gross Assets	4,879	5,333
Accumulated Amortization	(2,422)	(1,752)
Net Carrying Amount	2,457	3,581
Tenant Leases below Market
Intangible assets and liabilities
Gross Liability	(6,618)	(6,163)
Accumulated Accretion	2,065	1,350
Net Carrying Amount	(4,553)	(4,813)
Ground Leases above Market
Intangible assets and liabilities
Gross Liability	(1,955)	(3,545)
Accumulated Accretion	193	1,432
Net Carrying Amount	(1,762)	(2,113)
Ground Leases below Market
Intangible assets and liabilities
Gross Assets	23,096	23,096
Accumulated Amortization	(4,110)	(3,771)
Net Carrying Amount	$ 18,986	$ 19,325