Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Intangible Assets
In-place leases, net of accumulated amortization of $81,458 and $62,302 in 2015 and 2014, respectively	$ 119,539	$ 147,360
Above-market tenant leases, net of accumulated amortization of $14,891 and $13,748 in 2015 and 2014, respectively	8,579	12,017
Goodwill	3,740	3,867	$ 4,057	$ 4,131
Intangible Assets, Net (Including Goodwill)	131,858	163,244
In-place leases accumulated amortization	81,458	62,302
Above-market tenant leases accumulated amortization	$ 14,891	$ 13,748