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Other intangible assets (Details 2) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, net (excluding goodwill) | $ 4,318,000 | $ 4,209,000 | $ 4,318,000 | $ 4,209,000 | $ 3,837,000
Amortization of intangible assets | 300,000 | 500,000 | 900,000 | 1,700,000 |
Estimated amortization expense for amortizable intangible assets [Abstract] |  |  |  |  |
2018 | 1,400,000 |  | 1,400,000 |  |
2019 | 1,200,000 |  | 1,200,000 |  |
2020 | 600,000 |  | 600,000 |  |
2021 | 400,000 |  | 400,000 |  |
2022 | 400,000 |  | 400,000 |  |
Thereafter | 1,200,000 |  | 1,200,000 |  |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 15,920,000 | 15,248,000 | 15,920,000 | 15,248,000 | 15,248,000
Intangible assets, less accumulated amortization | 13,342,000 | 13,176,000 | 13,342,000 | 13,176,000 | 13,382,000
Intangible assets, net (excluding goodwill) | 2,578,000 | 2,072,000 | 2,578,000 | 2,072,000 | 1,866,000
Noncompete agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 2,606,000 | 2,430,000 | 2,606,000 | 2,430,000 | 2,430,000
Intangible assets, less accumulated amortization | 1,911,000 | 1,769,000 | 1,911,000 | 1,769,000 | 1,805,000
Intangible assets, net (excluding goodwill) | 695,000 | 661,000 | 695,000 | 661,000 | 625,000
Other intangible assets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 6,458,000 | 7,020,000 | 6,458,000 | 7,020,000 | 6,990,000
Intangible assets, less accumulated amortization | 5,413,000 | 5,544,000 | 5,413,000 | 5,544,000 | 5,644,000
Intangible assets, net (excluding goodwill) | $ 1,045,000 | $ 1,476,000 | $ 1,045,000 | $ 1,476,000 | $ 1,346,000

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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=109223946&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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