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Intangible Assets | 12 Months Ended
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Dec. 31, 2016
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 |  |  | $ | 37,422 |  |  | $ | 638 |
Customer relationships | 6,605 |  |  | 4,836 |  |  | $ | 1,769 |
Completed technologies | 8,003 |  |  | 2,098 |  |  | 5,905 |
Balance as of December 31, 2016 | $ | 52,668 |  |  | $ | 44,356 |  |  | $ | 8,312 |
| Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Distribution networks | $ | 38,060 |  |  | $ | 35,051 |  |  | $ | 3,009 |
Customer relationships | 4,880 |  |  | 4,749 |  |  | 131 |
Completed technologies | 4,340 |  |  | 1,165 |  |  | 3,175 |
Balance as of December 31, 2015 | $ | 47,280 |  |  | $ | 40,965 |  |  | $ | 6,315 |
Estimated amortization expense for each of the five succeeding fiscal years and thereafter is as follows (in thousands):
Year Ended December 31, |  | Amount
2017 |  | $ | 2,311 |
2018 |  | 1,770 |
2019 |  | 1,395 |
2020 |  | 971 |
2021 |  | 794 |
Thereafter |  | 1,071 |
|  | $ | 8,312 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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