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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2014
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, 2014.

Other intangible assets at March 31, 2014 and December 31, 2013, consisted of the following (in thousands):
 
March 31, 2014
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
9,702

 
$
(2,430
)
 
$
7,272

Distribution agreements
5,176

 
(1,900
)
 
3,276

License agreements
3,783

 
(1,360
)
 
2,423

Trademarks
7,622

 
(1,968
)
 
5,654

Covenants not to compete
1,029

 
(458
)
 
571

Customer lists
20,626

 
(11,555
)
 
9,071

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
48,205

 
$
(19,938
)
 
$
28,267


 
December 31, 2013
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
9,302

 
$
(2,374
)
 
$
6,928

Distribution agreements
5,176

 
(1,780
)
 
3,396

License agreements
3,783

 
(1,249
)
 
2,534

Trademarks
7,622

 
(1,844
)
 
5,778

Covenants not to compete
1,029

 
(399
)
 
630

Customer lists
20,626

 
(10,957
)
 
9,669

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
47,805

 
$
(18,870
)
 
$
28,935



Aggregate amortization expense for the three-month periods ended March 31, 2014 and 2013, was approximately $3.7 million and $3.5 million respectively.

Estimated amortization expense for the intangible assets for the next five years consists of the following as of March 31, 2014 (in thousands):

Year Ending December 31
 
Remaining 2014
$
11,423

2015
14,796

2016
14,061

2017
13,677

2018
13,140