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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015, are as follows (in thousands):
 
2016
 
2015
Goodwill balance at January 1
$
184,472

 
$
184,464

Effect of foreign exchange
82

 
(52
)
Additions as the result of acquisitions
27,373

 
60

Goodwill balance at December 31
$
211,927

 
$
184,472
Other intangible assets
Other intangible assets at December 31, 2016 and 2015, consisted of the following (in thousands):
 
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


 
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 December 31, 2016 (in thousands):

Year Ending December 31
 
2017
$
21,800

2018
21,229

2019
20,826

2020
19,732

2021
13,296