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Intangible Assets
 12 Months Ended
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Intangible Assets
ASSETS
At December 31, 2013 and 2012, intangible assets included the following (in thousands):
 
 
2013
 
2012
In-place leases, net of accumulated amortization of $26,239 and $5,729 in 2013 and 2012, respectively
 
$
152,830

 
$
21,637

Above-market tenant leases, net of accumulated amortization of $11,284 and $9,424 in 2013 and 2012, respectively
 
12,332

 
6,892

Below-market ground lease, net of accumulated amortization of $21 and $-0- in 2013 and 2012, respectively
 
1,680

 
—

Goodwill
 
4,131

 
4,751

 
 
$
170,973

 
$
33,280


Intangible assets, other than goodwill, mainly relate to the acquisitions in 2013, 2012, and 2011 (see note 3). Aggregate net amortization expense related to intangible assets and liabilities was $16.9 million, $3.3 million, and $305,000 for the years ended December 31, 2013, 2012, and 2011, respectively. Over the next five years and thereafter, aggregate amortization of these intangible assets and liabilities is anticipated to be as follows (in thousands):
 
Below 
Market Rents
 
Above 
Market Ground Lease
 
Below Market Ground Lease
 
Above 
Market Rents
 
In Place 
Leases
 
Total
2014
$
(10,470
)
 
$
(55
)
 
$
42

 
$
2,622

 
$
35,462

 
$
27,601

2015
(8,715
)
 
(55
)
 
42

 
2,042

 
27,528

 
20,842

2016
(8,091
)
 
(55
)
 
42

 
1,884

 
21,832

 
15,612

2017
(6,910
)
 
(55
)
 
42

 
1,474

 
15,913

 
10,464

2018
(6,271
)
 
(55
)
 
42

 
1,147

 
13,514

 
8,377

Thereafter
(23,409
)
 
(2,335
)
 
1,470

 
3,163

 
38,581

 
17,470

 
$
(63,866
)
 
$
(2,610
)
 
$
1,680

 
$
12,332

 
$
152,830

 
$
100,366

Weighted average remaining lease term
9 years

 
50 years

 
41 years

 
7 years

 
8 years

 
20 years


Goodwill relates entirely to the office reporting unit. As office assets are sold, either by the Company or by joint ventures in which the Company has an interest, goodwill is allocated to the cost of each sale. The following is a summary of goodwill activity for the years ended December 31, 2013 and 2012 (in thousands):

 
2013
 
2012
Beginning Balance
$
4,751

 
$
5,155

Allocated to property sales
(620
)
 
(404
)
Ending Balance
$
4,131

 
$
4,751