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Intangible Assets on Real Estate Acquisitions
12 Months Ended
Dec. 31, 2014
Intangible Assets on Real Estate Acquisitions  
Intangible Assets on Real Estate Acquisitions
Intangible Assets on Real Estate Acquisitions

Intangible assets on real estate acquisitions consisted of the following (in thousands):
 
 
December 31, 2014
 
December 31, 2013
 
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Carrying Amount
In-place lease value
 
$
123,759

 
$
101,040

 
$
22,719

 
$
125,504

 
$
93,885

 
$
31,619

Tenant relationship value
 
42,301

 
28,492

 
13,809

 
44,414

 
25,962

 
18,452

Below-market cost arrangements
 
12,415

 
5,984

 
6,431

 
12,416

 
5,136

 
7,280

Above-market leases
 
8,659

 
8,159

 
500

 
8,925

 
7,970

 
955

Market concentration premium
 
1,333

 
938

 
395

 
1,333

 
381

 
952

 
 
$
188,467

 
$
144,613

 
$
43,854

 
$
192,592

 
$
133,334

 
$
59,258



Amortization of the intangible asset categories set forth above totaled $15.2 million in 2014, $16.2 million in 2013 and $21.4 million in 2012. The approximate weighted average amortization periods of the categories set forth above follow: in-place lease value: six years; tenant relationship value: seven years; below-market cost arrangements: 31 years; above-market leases: two years; and market concentration premium: 28 years. The approximate weighted average amortization period for all of the categories combined is ten years. The estimated amortization expense associated with the intangible asset categories set forth above for the next five years is: $9.3 million for 2015; $8.4 million for 2016; $6.2 million for 2017; $3.8 million for 2018; and $3.4 million for 2019.