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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 were as follows (in thousands):
 
2019
Goodwill balance at January 1
$
335,433

Effect of foreign exchange
(181
)
Additions and adjustments as the result of acquisitions
16,881

Goodwill balance at June 30
$
352,133
Other intangible assets
Other intangible assets at June 30, 2019 and December 31, 2018, consisted of the following (in thousands):
 
June 30, 2019
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
20,985

 
$
(5,850
)
 
$
15,135

Distribution agreements
8,012

 
(6,280
)
 
1,732

License agreements
27,008

 
(9,016
)
 
17,992

Trademarks
30,246

 
(8,035
)
 
22,211

Covenants not to compete
1,028

 
(1,016
)
 
12

Customer lists
40,009

 
(26,092
)
 
13,917

In-process technology
3,420

 
—

 
3,420

 
 
 
 
 
 
Total
$
130,708

 
$
(56,289
)
 
$
74,419


 
December 31, 2018
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
19,378

 
$
(5,012
)
 
$
14,366

Distribution agreements
8,012

 
(5,766
)
 
2,246

License agreements
26,930

 
(7,411
)
 
19,519

Trademarks
29,998

 
(6,586
)
 
23,412

Covenants not to compete
1,028

 
(1,000
)
 
28

Customer lists
39,936

 
(23,361
)
 
16,575

In-process technology
3,420

 
—

 
3,420

 
 
 
 
 
 
Total
$
128,702

 
$
(49,136
)
 
$
79,566
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, 2019 (in thousands):

Year Ending December 31
 
Remaining 2019
$
30,817

2020
58,907

2021
51,550

2022
50,129

2023
48,830