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Goodwill and other intangible assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and other intangible assets |
Schedule of changes in carrying amount of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
​ | ​ | (in thousands)
Goodwill, beginning of period | ​ | $ | 539,818 | ​ | $ | 529,145 | ​ | $ | 539,818 | ​ | $ | 501,145
Goodwill acquired | ​ |  | — | ​ |  | 10,673 | ​ |  | — | ​ |  | 38,673
Goodwill, end of period | ​ | $ | 539,818 | ​ | $ | 539,818 | ​ | $ | 539,818 | ​ | $ | 539,818
Schedule of gross carrying amount and accumulated amortization of intangible assets other than goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Weighted‑
​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Average
​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​ | Net Carrying |  | Remaining
​ | ​ | Useful Life | ​ | Gross Value | ​ | Amortization | ​ | Value |  | Useful Life
​ | ​ | ​ | ​ | (in thousands) | ​ | ​
Trademarks | ​ | 1‑8 years | ​ | $ | 34,320 | ​ | $ | 9,167 | ​ | $ | 25,153 |  | 5.8 years
Customer relationships | ​ | 2‑12 years | ​ |  | 214,320 | ​ |  | 37,564 | ​ |  | 176,756 |  | 9.7 years
Developed technology | ​ | 5 years | ​ |  | 53,560 | ​ |  | 20,419 | ​ |  | 33,141 |  | 3.2 years
Non‑competes | ​ | 2 years | ​ |  | 90 | ​ |  | 41 | ​ |  | 49 |  | 1.1 years
Balance, December 31, 2019 | ​ | ​ | ​ | $ | 302,290 | ​ | $ | 67,191 | ​ | $ | 235,099 |  |
Trademarks | ​ | 8 years | ​ | $ | 34,320 | ​ | $ | 12,383 | ​ | $ | 21,937 |  | 5.1 years
Customer relationships | ​ | 2‑12 years | ​ |  | 214,320 | ​ |  | 51,259 | ​ |  | 163,061 |  | 9.0 years
Developed technology | ​ | 5 years | ​ |  | 53,560 | ​ |  | 28,453 | ​ |  | 25,107 |  | 2.4 years
Non‑competes | ​ | 2 years | ​ |  | 90 | ​ |  | 75 | ​ |  | 15 |  | 0.3 years
Balance, September 30, 2020 | ​ | ​ | ​ | $ | 302,290 | ​ | $ | 92,170 | ​ | $ | 210,120 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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