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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in carrying amount of goodwill
The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013, are as follows (in thousands):

 
2014
 
2013
Goodwill balance at January 1
$
184,505

 
$
175,108

Effect of foreign exchange
(41
)
 
$
—

Adjustment related to previous acquisitions
—

 
381

Additions as the result of acquisitions
—

 
9,016

Goodwill balance at December 31
$
184,464

 
$
184,505
Other intangible assets
Other intangible assets at December 31, 2014 and 2013, consisted of the following (in thousands):

 
2014
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
10,199

 
$
(2,196
)
 
$
8,003

Distribution agreements
5,376

 
(2,285
)
 
3,091

License agreements
8,995

 
(1,823
)
 
7,172

Trademarks
7,298

 
(2,079
)
 
5,219

Covenants not to compete
1,029

 
(636
)
 
393

Customer lists
20,452

 
(13,194
)
 
7,258

Royalty agreements
267

 
(267
)
 
—

 
 
 
 
 
 
Total
$
53,616

 
$
(22,480
)
 
$
31,136


 
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
Estimated amortization expense
Estimated amortization expense for the developed technology and other intangible assets for the next five years consists of the following as of December 31, 2014 (in thousands):

Year Ending December 31
 
2015
$
14,525

2016
14,381

2017
13,911

2018
13,197

2019
12,916