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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Intangible Assets |
Schedule of intangible asset activity | Intangible asset activity for the nine months ended September 30, 2018 is detailed in the following table.
in thousands |  | Acquired Technology |  | Customer Relationships |  | Other |  | Total Intangible Assets
Net balance at December 31, 2017 |  | $ | 6,946 |  | $ | 22,544 |  | $ | 8,398 |  | $ | 37,888
Additions-Acquisition |  |  | 5,900 |  |  | 10,000 |  |  | 200 |  |  | 16,100
Additions-Other |  |  | — |  |  | — |  |  | 143 |  |  | 143
Impairment |  |  | — |  |  | — |  |  | (478) |  |  | (478)
Net foreign currency translation |  |  | (68) |  |  | (241) |  |  | 105 |  |  | (204)
Amortization expense |  |  | (3,017) |  |  | (2,294) |  |  | (1,598) |  |  | (6,909)
Net balance at September 30, 2018 |  | $ | 9,761 |  | $ | 30,009 |  | $ | 6,770 |  | $ | 46,540
September 30, 2018 balance at cost |  | $ | 42,735 |  | $ | 37,718 |  | $ | 13,650 |  | $ | 94,103
Accumulated amortization |  |  | (32,974) |  |  | (7,709) |  |  | (6,880) |  |  | (47,563)
Net balance at September 30, 2018 |  | $ | 9,761 |  | $ | 30,009 |  | $ | 6,770 |  | $ | 46,540

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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