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
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 221,039   $ 188,467
Accumulated Amortization 139,311   144,613
Net Carrying Amount 81,728   43,854
Amortization of intangible assets $ 7,000 $ 7,400  
Weighted average useful life 9 years    
Estimated future amortization expense associated with the intangible asset categories for the next five years      
Remainder of fiscal year $ 8,600    
2016 16,600    
2017 14,300    
2018 9,500    
2019 6,700    
2020 5,100    
In-place lease value      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 134,387   123,759
Accumulated Amortization 95,910   101,040
Net Carrying Amount $ 38,477   22,719
Weighted average useful life 5 years    
Tenant relationship value      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 58,560   42,301
Accumulated Amortization 27,666   28,492
Net Carrying Amount $ 30,894   13,809
Weighted average useful life 9 years    
Below-market cost arrangements      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 12,415   12,415
Accumulated Amortization 6,324   5,984
Net Carrying Amount $ 6,091   6,431
Weighted average useful life 32 years    
Above-market leases      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 14,344   8,659
Accumulated Amortization 8,467   8,159
Net Carrying Amount $ 5,877   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 944   938
Net Carrying Amount $ 389   $ 395
Weighted average useful life 27 years