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Intangible Assets
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Amortized intangible assets consisted of the following (in thousands):
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Distribution networks
$
38,060

 
$
38,060

 
$
—

Completed technologies
13,687

 
4,181

 
9,506

Customer relationships
8,607

 
5,202

 
3,405

Non-compete agreements
370

 
92

 
278

Balance as of December 31, 2017
$
60,724

 
$
47,535

 
$
13,189

 
 
 
 
 
 
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
Distribution networks
$
38,060

 
$
37,422

 
$
638

Completed technologies
8,003

 
2,098

 
5,905

Customer relationships
6,605

 
4,836

 
1,769

Balance as of December 31, 2016
$
52,668

 
$
44,356

 
$
8,312


Estimated amortization expense for each of the five succeeding fiscal years and thereafter is as follows (in thousands):
Year Ended December 31,
 
Amount
2018
 
$
3,076

2019
 
2,701

2020
 
2,185

2021
 
2,017

2022
 
1,691

Thereafter
 
1,519

 
 
$
13,189