Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets on Real Estate Acquisition, Net (Details)

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Intangible Assets on Real Estate Acquisition, Net (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 231,806   $ 188,467
Accumulated Amortization 125,632   144,613
Net Carrying Amount 106,174   43,854
Amortization of intangible assets $ 11,900 $ 10,800  
Weighted average useful life 10 years    
Estimated future amortization expense associated with the intangible asset categories for the next five years      
Remainder of fiscal year $ 5,100    
2016 19,700    
2017 17,100    
2018 12,300    
2019 9,300    
2020 7,300    
In-place lease value      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 138,410   123,759
Accumulated Amortization 87,667   101,040
Net Carrying Amount $ 50,743   22,719
Weighted average useful life 6 years    
Tenant relationship value      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 63,117   42,301
Accumulated Amortization 22,525   28,492
Net Carrying Amount $ 40,592   13,809
Weighted average useful life 11 years    
Below-market cost arrangements      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 15,102   12,415
Accumulated Amortization 6,505   5,984
Net Carrying Amount $ 8,597   6,431
Weighted average useful life 35 years    
Above-market leases      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 13,844   8,659
Accumulated Amortization 7,987   8,159
Net Carrying Amount $ 5,857   500
Weighted average useful life 4 years    
Market concentration premium      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 1,333   1,333
Accumulated Amortization 948   938
Net Carrying Amount $ 385   $ 395
Weighted average useful life 27 years