Acquired Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquired Intangible Assets and Liabilities
Amortization of above and below Market Leases	$ 500	$ 600	$ 800
Amortization of intangible assets	(520)	(556)	(823)
Below-market lease contract value, gross	10,000	10,300
Accumulated amortization of below-market lease	5,300	4,700
Estimated amortization of acquired below-market leases, net of acquired above-market leases
2016	541
2017	572
2018	573
2019	245
2020	136
Thereafter	2,195
Total	4,262
Estimated amortization of all other identified intangible assets
2016	1,630
2017	1,136
2018	621
2019	316
2020	115
Thereafter	457
Total	4,275
Lease contracts value, gross	14,000	18,800
Accumulated amortization	9,700	12,500
Above Market Leases [Member]
Estimated amortization of all other identified intangible assets
Lease contracts value, gross	2,200	2,700
Accumulated amortization	1,800	1,900
Other Intangible Assets [Member]
Acquired Intangible Assets and Liabilities
Amortization of intangible assets	$ 2,000	$ 3,400	$ 7,400