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

Effect of foreign exchange
2,418

Additions as the result of acquisitions
19,698

Goodwill balance at September 30
$
234,043
Other intangible assets
Other intangible assets at September 30, 2017 and December 31, 2016, consisted of the following (in thousands):
 
September 30, 2017
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
15,972

 
$
(3,586
)
 
$
12,386

Distribution agreements
6,626

 
(4,248
)
 
2,378

License agreements
23,804

 
(4,387
)
 
19,417

Trademarks
16,220

 
(4,342
)
 
11,878

Covenants not to compete
1,028

 
(961
)
 
67

Customer lists
25,942

 
(17,461
)
 
8,481

In-process technology
1,100

 
—

 
1,100

 
 
 
 
 
 
Total
$
90,692

 
$
(34,985
)
 
$
55,707


 
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 September 30, 2017 (in thousands):

Year Ending December 31
 
Remaining 2017
$
6,745

2018
26,152

2019
25,678

2020
24,524

2021
18,013