Intangible Assets and Liabilities Annual Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Intangible Assets, net	$ 127,088	$ 99,403
Liabilities
Below Market Lease, Net	28,541	$ 26,010
Assets [Member]
Assets
2015 (three months remaining)	12,262
2016	36,901
2017	20,080
2018	12,852
2019	11,553
Thereafter	33,440
Intangible Assets, net	127,088
Liabilities [Member]
Liabilities
2015 (three months remaining)	2,669
2016	7,595
2017	3,461
2018	2,217
2019	1,885
Thereafter	10,714
Below Market Lease, Net	$ 28,541