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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2013
Goodwill [Line Items]  
Schedule of Expected Amortization Expense [Table Text Block]
The following table summarizes our aggregate amortization expense related to acquisition related intangible assets (in thousands):
 
 
Three Months Ended
March 31,
 
2013
 
2012
Aggregate amortization expense
$
5,044

 
$
4,876
Goodwill
Goodwill
The following table presents the changes in the carrying amount of our goodwill for the three months ended March 31, 2013 (in thousands):
 
 
Animal
Hospital
 
Laboratory
 
All Other
 
Total
Balance as of December 31, 2012
 
 
 
 
 
 
 
Goodwill
$
1,177,348

 
$
96,861

 
$
137,833

 
$
1,412,042

Accumulated impairment losses
—

 
—

 
(120,811
)
 
(120,811
)
Balance as of December 31, 2012, net
1,177,348

 
96,861

 
17,022

 
1,291,231

Goodwill acquired
4,957

 
15

 
—

 
4,972

Foreign translation adjustment
(2,034
)
 
(15
)
 
—

 
(2,049
)
Other (1)
(389
)
 
—

 
424

 
35

Balance as of March 31, 2013
 
 
 
 
 
 
 
Goodwill
1,179,882

 
96,861

 
138,257

 
1,415,000

Accumulated impairment losses
—

 
—

 
(120,811
)
 
(120,811
)
Balance as of March 31, 2013, net
$
1,179,882

 
$
96,861

 
$
17,446

 
$
1,294,189

 ____________________________

(1) 
Other includes acquisition-price adjustments, and adjustments related to the sale of animal hospitals.
Other Intangible Assets
Our acquisition related amortizable intangible assets at March 31, 2013 and December 31, 2012 are as follows (in thousands):
 
 
As of March 31, 2013
 
As of December 31, 2012
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Non-contractual customer relationships
$
107,045

 
$
(36,467
)
 
$
70,578

 
$
110,404

 
$
(36,605
)
 
$
73,799

Covenants not-to-compete
11,703

 
(6,782
)
 
4,921

 
12,707

 
(7,357
)
 
5,350

Favorable lease assets
7,228

 
(3,999
)
 
3,229

 
7,228

 
(3,866
)
 
3,362

Trademarks
12,296

 
(3,290
)
 
9,006

 
12,494

 
(3,001
)
 
9,493

Contracts
956

 
(591
)
 
365

 
956

 
(570
)
 
386

Technology
6,588

 
(4,312
)
 
2,276

 
6,588

 
(4,179
)
 
2,409

Client lists
50

 
(30
)
 
20

 
50

 
(26
)
 
24

Total
$
145,866

 
$
(55,471
)
 
$
90,395

 
$
150,427

 
$
(55,604
)
 
$
94,823
Estimated amortization expense related to intangible assets
The estimated amortization expense related to intangible assets for the remainder of 2013 and each of the succeeding years thereafter, as of March 31, 2013, is as follows (in thousands):

Remainder of 2013
$
15,367

2014
18,500

2015
16,462

2016
13,416

2017
6,867

Thereafter
19,783

Total
$
90,395