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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in carrying amount of goodwill
The changes in the carrying amount of goodwill for the six months ended June 30, 2016 were as follows (in thousands):

 
2016
Goodwill balance at January 1
$
184,472

Effect of foreign exchange
7

Additions as the result of acquisitions
2,555

Goodwill balance at June 30
$
187,034
Other intangible assets
Other intangible assets at June 30, 2016 and December 31, 2015, consisted of the following (in thousands):

 
June 30, 2016
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
12,914

 
$
(2,829
)
 
$
10,085

Distribution agreements
5,626

 
(3,148
)
 
2,478

License agreements
20,194

 
(2,790
)
 
17,404

Trademarks
7,974

 
(2,861
)
 
5,113

Covenants not to compete
1,029

 
(903
)
 
126

Customer lists
21,152

 
(15,771
)
 
5,381

Royalty agreements
267

 
(267
)
 
—

 
 
 
 
 
 
Total
$
69,156

 
$
(28,569
)
 
$
40,587


 
December 31, 2015
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
12,014

 
$
(2,595
)
 
$
9,419

Distribution agreements
5,626

 
(2,853
)
 
2,773

License agreements
19,109

 
(2,438
)
 
16,671

Trademarks
7,259

 
(2,554
)
 
4,705

Covenants not to compete
1,028

 
(873
)
 
155

Customer lists
20,793

 
(15,023
)
 
5,770

Royalty agreements
267

 
(267
)
 
—

 
 
 
 
 
 
Total
$
66,096

 
$
(26,603
)
 
$
39,493
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 June 30, 2016 (in thousands):

Year Ending December 31
 
Remaining 2016
$
9,313

2017
16,976

2018
16,429

2019
16,101

2020
15,117