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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2020
Intangible Assets |
Schedule of intangible asset activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​
in thousands |  | Acquired Technology |  | Customer Relationships |  | Other |  | Total Intangible Assets
Net balance at December 31, 2019 | ​ | $ | 5,454 | ​ | $ | 26,884 | ​ | $ | 3,871 | ​ | $ | 36,209
Additions | ​ |  | — | ​ | ​ | — | ​ | ​ | 48 | ​ |  | 48
Disposals | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (5) | ​ | ​ | (5)
Net foreign currency translation | ​ |  | (207) | ​ | ​ | (697) | ​ | ​ | (7) | ​ |  | (911)
Amortization expense | ​ |  | (1,714) | ​ | ​ | (1,799) | ​ | ​ | (1,176) | ​ |  | (4,689)
Net balance at June 30, 2020 | ​ | $ | 3,533 | ​ | $ | 24,388 | ​ | $ | 2,731 | ​ | $ | 30,652
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
June 30, 2020 balance at cost | ​ | $ | 42,171 | ​ | $ | 38,691 | ​ | $ | 13,700 | ​ | $ | 94,562
Accumulated amortization | ​ |  | (38,638) | ​ |  | (14,303) | ​ |  | (10,969) | ​ |  | (63,910)
Net balance at June 30, 2020 | ​ | $ | 3,533 | ​ | $ | 24,388 | ​ | $ | 2,731 | ​ | $ | 30,652

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