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Other intangible assets (Details 2) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net (excluding goodwill) | $ 3,465,000 | $ 5,347,000 | $ 3,837,000
Amortization of intangible assets | 400,000 | 600,000 |
Estimated amortization expense for amortizable intangible assets [Abstract] |  |  |
2018 | 1,300,000 |  |
2019 | 1,000,000.0 |  |
2020 | 500,000 |  |
2021 | 300,000 |  |
2022 | 300,000 |  |
Thereafter | 500,000 |  |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 14,668,000 | 15,745,000 | 15,248,000
Intangible assets, less accumulated amortization | 13,007,000 | 12,910,000 | 13,382,000
Intangible assets, net (excluding goodwill) | 1,661,000 | 2,835,000 | 1,866,000
Noncompete agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 2,430,000 | 2,430,000 | 2,430,000
Intangible assets, less accumulated amortization | 1,842,000 | 1,695,000 | 1,805,000
Intangible assets, net (excluding goodwill) | 588,000 | 735,000 | 625,000
Other intangible assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 6,458,000 | 7,086,000 | 6,990,000
Intangible assets, less accumulated amortization | 5,242,000 | 5,309,000 | 5,644,000
Intangible assets, net (excluding goodwill) | $ 1,216,000 | $ 1,777,000 | $ 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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