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Other intangible assets (Details 2) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net (excluding goodwill) | $ 34,250,000 | $ 11,680,000 | $ 15,246,000
Amortization of intangible assets | 2,000,000.0 | 600,000 |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 30,087,000 | 14,471,000 | 17,958,000
Intangible assets, less accumulated amortization | 4,138,000 | 5,156,000 | 6,268,000
Intangible assets, net (excluding goodwill) | 25,949,000 | 9,315,000 | 11,690,000
Noncompete agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 4,229,000 | 3,179,000 | 3,439,000
Intangible assets, less accumulated amortization | 1,928,000 | 1,730,000 | 1,957,000
Intangible assets, net (excluding goodwill) | 2,301,000 | 1,449,000 | 1,482,000
Other intangible assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 13,060,000 | 6,458,000 | 8,094,000
Intangible assets, less accumulated amortization | 7,060,000 | 5,542,000 | 6,020,000
Intangible assets, net (excluding goodwill) | 6,000,000 | $ 916,000 | $ 2,074,000
Series of individually immaterial business combinations |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other intangible assets acquired | $ 21,000,000.0 |  |

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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=118932676&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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