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Other intangible assets (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, net (excluding goodwill) | $ 22,241 | $ 26,376 | $ 22,241 | $ 26,376 | $ 25,496
Amortization of intangible assets | 1,200 | 2,100 | 3,900 | 6,800 |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 29,423 | 27,551 | 29,423 | 27,551 | 28,836
Intangible assets, less accumulated amortization | 9,705 | 5,958 | 9,705 | 5,958 | 6,887
Intangible assets, net (excluding goodwill) | 19,718 | 21,593 | 19,718 | 21,593 | 21,949
Noncompete agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 3,991 | 3,941 | 3,991 | 3,941 | 3,941
Intangible assets, less accumulated amortization | 2,710 | 2,176 | 2,710 | 2,176 | 2,309
Intangible assets, net (excluding goodwill) | 1,281 | 1,765 | 1,281 | 1,765 | 1,632
Other intangible assets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 11,957 | 12,853 | 11,957 | 12,853 | 12,927
Intangible assets, less accumulated amortization | 10,715 | 9,835 | 10,715 | 9,835 | 11,012
Intangible assets, net (excluding goodwill) | $ 1,242 | $ 3,018 | $ 1,242 | $ 3,018 | $ 1,915

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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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