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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Intangible assets    
Total Cost $ 152,611 $ 176,983
Accumulated Amortization (81,991) (106,468)
Intangible Assets, net 70,620 70,515
In-place lease value [Member]
    
Intangible assets    
Total Cost 87,909 91,426
Accumulated Amortization (42,894) (55,498)
Intangible Assets, net 45,015 35,928
Tenant relationship value [Member]
    
Intangible assets    
Total Cost 56,137 72,813
Accumulated Amortization (37,389) (45,114)
Intangible Assets, net 18,748 27,699
Above market leases acquired [Member]
    
Intangible assets    
Total Cost 8,565 12,744
Accumulated Amortization (1,708) (5,856)
Intangible Assets, net 6,857 6,888
Below market leases acquired [Member]
    
Intangible assets    
Total Cost 77,083 75,685
Accumulated Amortization (43,224) (40,579)
Intangible Assets, net $ 33,859 $ 35,106