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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in carrying amount of goodwill
The changes in the carrying amount of goodwill for the six-month period ended June 30, 2017 were as follows (in thousands):
 
2017
Goodwill balance at January 1
$
211,927

Effect of foreign exchange
1,686

Additions as the result of acquisitions
13,216

Goodwill balance at June 30
$
226,829
Other intangible assets
Other intangible assets at June 30, 2017 and December 31, 2016, consisted of the following (in thousands):
 
June 30, 2017
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
15,192

 
$
(3,444
)
 
$
11,748

Distribution agreements
6,626

 
(4,013
)
 
2,613

License agreements
21,284

 
(4,067
)
 
17,217

Trademarks
16,208

 
(3,992
)
 
12,216

Covenants not to compete
1,029

 
(953
)
 
76

Customer lists
25,603

 
(16,642
)
 
8,961

In-process technology
850

 
—

 
850

 
 
 
 
 
 
Total
$
86,792

 
$
(33,111
)
 
$
53,681


 
December 31, 2016
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
14,130

 
$
(3,165
)
 
$
10,965

Distribution agreements
6,626

 
(3,527
)
 
3,099

License agreements
20,695

 
(3,422
)
 
17,273

Trademarks
12,380

 
(3,330
)
 
9,050

Covenants not to compete
1,028

 
(936
)
 
92

Customer lists
22,261

 
(15,401
)
 
6,860

Royalty agreements
267

 
(267
)
 
—

 
 
 
 
 
 
Total
$
77,387

 
$
(30,048
)
 
$
47,339
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, 2017 (in thousands):

Year Ending December 31
 
Remaining 2017
$
12,679

2018
24,565

2019
24,196

2020
23,079

2021
16,614