Annual report pursuant to Section 13 and 15(d)

Intangible Assets on Real Estate Acquisitions (Details)

v3.8.0.1
Intangible Assets on Real Estate Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 222,683 $ 223,054  
Accumulated Amortization 163,591 144,703  
Net Carrying Amount 59,092 78,351  
Amortization of the intangible assets $ 19,300 20,000 $ 18,500
Weighted average amortization period of intangible assets 11 years    
Estimated future amortization expense associated with the intangible asset categories for the next five years      
2018 $ 14,500    
2019 8,100    
2020 5,700    
2021 5,500    
2022 4,100    
In-place lease value [Member]      
Intangible assets on real estate acquisitions      
Gross Carrying Amount 132,276 132,647  
Accumulated Amortization 110,814 99,940  
Net Carrying Amount $ 21,462 32,707  
Weighted average amortization period of intangible assets 6 years    
Tenant relationship value [Member]      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 60,028 60,028  
Accumulated Amortization 32,198 26,253  
Net Carrying Amount $ 27,830 33,775  
Weighted average amortization period of intangible assets 8 years    
Below-market cost arrangements [Member]      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 15,102 15,102  
Accumulated Amortization 7,507 7,285  
Net Carrying Amount $ 7,595 7,817  
Weighted average amortization period of intangible assets 34 years    
Above-market leases [Member]      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 13,944 13,944  
Accumulated Amortization 12,092 10,259  
Net Carrying Amount $ 1,852 3,685  
Weighted average amortization period of intangible assets 3 years    
Other [Member]      
Intangible assets on real estate acquisitions      
Gross Carrying Amount $ 1,333 1,333  
Accumulated Amortization 980 966  
Net Carrying Amount $ 353 $ 367  
Weighted average amortization period of intangible assets 25 years