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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The following table presents the changes in the carrying amount of our goodwill for the six months ended June 30, 2014 (in thousands):
 
 
Animal
Hospital
 
Laboratory
 
All Other
 
Total
Balance as of December 31, 2013
 
 
 
 
 
 
 
Goodwill
$
1,216,581

 
$
96,871

 
$
138,276

 
$
1,451,728

Accumulated impairment losses
—

 
—

 
(120,811
)
 
(120,811
)
Subtotal
1,216,581

 
96,871

 
17,465

 
1,330,917

Goodwill acquired
26,761

 
—

 
—

 
26,761

Foreign translation adjustment
(603
)
 
(3
)
 
—

 
(606
)
Other (1)
(1,676
)
 
—

 
—

 
(1,676
)
Balance as of June 30, 2014
 
 
 
 
 
 
 
Goodwill
1,241,063

 
96,868

 
138,276

 
1,476,207

Accumulated impairment losses
—

 
—

 
(120,811
)
 
(120,811
)
Subtotal
$
1,241,063

 
$
96,868

 
$
17,465

 
$
1,355,396

 ____________________________

(1) 
"Other" primarily includes immaterial measurement period adjustments and an immaterial write-off related to the sale of an animal hospital.
Other Intangible Assets
Our acquisition related amortizable intangible assets at June 30, 2014 and December 31, 2013 are as follows (in thousands):
 
 
As of June 30, 2014
 
As of December 31, 2013
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Non-contractual customer relationships
$
110,968

 
$
(47,822
)
 
$
63,146

 
$
109,842

 
$
(41,895
)
 
$
67,947

Covenants not-to-compete
8,672

 
(4,461
)
 
4,211

 
8,843

 
(4,661
)
 
4,182

Favorable lease assets
9,552

 
(4,663
)
 
4,889

 
7,458

 
(4,373
)
 
3,085

Trademarks
12,987

 
(4,696
)
 
8,291

 
13,115

 
(4,194
)
 
8,921

Contracts
608

 
(346
)
 
262

 
608

 
(305
)
 
303

Technology
5,240

 
(3,293
)
 
1,947

 
5,240

 
(3,015
)
 
2,225

Client lists
—

 
—

 
—

 
50

 
(42
)
 
8

Total
$
148,027

 
$
(65,281
)
 
$
82,746

 
$
145,156

 
$
(58,485
)
 
$
86,671
Estimated amortization expense related to intangible assets
The following table summarizes our aggregate amortization expense related to acquisition related intangible assets (in thousands):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
Aggregate amortization expense
$
5,227

 
$
5,521

 
$
10,374

 
$
10,565


The estimated amortization expense related to acquisition related intangible assets for the remainder of 2014 and each of the succeeding years thereafter, as of June 30, 2014, is as follows (in thousands):

Remainder of 2014
$
10,655

2015
19,719

2016
16,777

2017
10,420

2018
6,824

Thereafter
18,351

Total
$
82,746