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Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Intangible Assets [Line Items]    
Total Cost $ 211,754 $ 169,224
Accumulated Amortization (74,464) (69,821)
Intangible Assets, net 137,290 99,403
Below Market Lease, Gross 60,963 53,049
Below Market Lease, Accumulated Amortization (29,398) (27,039)
Below Market Lease, Net 31,565 26,010
In-place lease value [Member]    
Intangible Assets [Line Items]    
Total Cost 176,041 129,411
Accumulated Amortization (48,435) (42,068)
Intangible Assets, net 127,606 87,343
Tenant relationship value [Member]    
Intangible Assets [Line Items]    
Total Cost 30,203 34,172
Accumulated Amortization (24,339) (26,344)
Intangible Assets, net 5,864 7,828
Above market leases acquired [Member]    
Intangible Assets [Line Items]    
Total Cost 5,510 5,641
Accumulated Amortization (1,690) (1,409)
Intangible Assets, net $ 3,820 $ 4,232