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Goodwill and other intangible assets - Intangible assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Value | $ 302,290 |  | $ 302,290 |  | $ 302,290
Accumulated Amortization | 92,170 |  | 92,170 |  | 67,191
Net Carrying Value | 210,120 |  | 210,120 |  | 235,099
Amortization expense | 8,300 |  | 25,000 | $ 24,500 |
Impairment of goodwill | 0 | $ 0 | 0 | 0 |
Impairment of Intangible Assets | 0 | $ 0 | $ 0 | $ 0 |
Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful Life |  |  | 8 years |  |
Gross Value | 34,320 |  | $ 34,320 |  | 34,320
Accumulated Amortization | 12,383 |  | 12,383 |  | 9,167
Net Carrying Value | 21,937 |  | $ 21,937 |  | $ 25,153
Weighted-Average Remaining Useful Life |  |  | 5 years 1 month 6 days |  | 5 years 9 months 18 days
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Value | 214,320 |  | $ 214,320 |  | $ 214,320
Accumulated Amortization | 51,259 |  | 51,259 |  | 37,564
Net Carrying Value | 163,061 |  | $ 163,061 |  | $ 176,756
Weighted-Average Remaining Useful Life |  |  | 9 years |  | 9 years 8 months 12 days
Developed technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful Life |  |  | 5 years |  | 5 years
Gross Value | 53,560 |  | $ 53,560 |  | $ 53,560
Accumulated Amortization | 28,453 |  | 28,453 |  | 20,419
Net Carrying Value | 25,107 |  | $ 25,107 |  | $ 33,141
Weighted-Average Remaining Useful Life |  |  | 2 years 4 months 24 days |  | 3 years 2 months 12 days
Non-competes |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful Life |  |  | 2 years |  | 2 years
Gross Value | 90 |  | $ 90 |  | $ 90
Accumulated Amortization | 75 |  | 75 |  | 41
Net Carrying Value | $ 15 |  | $ 15 |  | $ 49
Weighted-Average Remaining Useful Life |  |  | 3 months 18 days |  | 1 year 1 month 6 days
Maximum | Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful Life |  |  |  |  | 8 years
Maximum | Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful Life |  |  | 12 years |  | 12 years
Minimum | Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful Life |  |  |  |  | 1 year
Minimum | Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful Life |  |  | 2 years |  | 2 years

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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