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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets. There were no changes in the carrying amount of goodwill for the three months ended March 31, 2013.

Other intangible assets at March 31, 2013 and December 31, 2012, consisted of the following (in thousands):

 
March 31, 2013
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
8,234

 
$
(2,145
)
 
$
6,089

Distribution agreement
5,176

 
(1,421
)
 
3,755

License agreements
2,733

 
(959
)
 
1,774

Trademark
7,299

 
(1,479
)
 
5,820

Covenant not to compete
1,035

 
(219
)
 
816

Customer lists
20,451

 
(8,758
)
 
11,693

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
45,195

 
$
(15,248
)
 
$
29,947


 
December 31, 2012
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
7,843

 
$
(2,045
)
 
$
5,798

Distribution agreement
5,176

 
(1,301
)
 
3,875

License agreements
2,733

 
(861
)
 
1,872

Trademark
7,311

 
(1,362
)
 
5,949

Covenant not to compete
1,035

 
(160
)
 
875

Customer lists
20,468

 
(8,038
)
 
12,430

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
44,833

 
$
(14,034
)
 
$
30,799



Aggregate amortization expense for the three months ended March 31, 2013 and 2012, was approximately $3.5 million and $1.9 million, respectively.

Estimated amortization expense for intangible assets for the next five years consisted of the following as of March 31, 2013 (in thousands):

Year Ending December 31
 
Remaining 2013
$
10,428

2014
13,267

2015
12,722

2016
12,101

2017
11,738