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Other intangible assets (Details 2) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, net (excluding goodwill) | $ 8,506,000 | $ 11,266,000 | $ 8,506,000 | $ 11,266,000 | $ 9,840,000
Amortization of intangible assets | 700,000 | 1,000,000 | 1,400,000 | 1,800,000 |
Estimated amortization expense for amortizable intangible assets [Abstract] |  |  |  |  |
2015 | 2,500,000 |  | 2,500,000 |  |
2016 | 2,200,000 |  | 2,200,000 |  |
2017 | 1,900,000 |  | 1,900,000 |  |
2018 | 1,000,000 |  | 1,000,000 |  |
2019 | 900,000 |  | 900,000 |  |
Thereafter | 1,400,000 |  | 1,400,000 |  |
Customer relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 20,975,000 | 21,310,000 | 20,975,000 | 21,310,000 | 21,310,000
Intangible assets, accumulated amortization | (16,065,000) | (14,734,000) | (16,065,000) | (14,734,000) | (15,556,000)
Intangible assets, net (excluding goodwill) | 4,910,000 | 6,576,000 | 4,910,000 | 6,576,000 | 5,754,000
Noncompete agreements [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 4,409,000 | 5,080,000 | 4,409,000 | 5,080,000 | 5,080,000
Intangible assets, accumulated amortization | (3,581,000) | (3,936,000) | (3,581,000) | (3,936,000) | (4,098,000)
Intangible assets, net (excluding goodwill) | 828,000 | 1,144,000 | 828,000 | 1,144,000 | 982,000
Other intangible assets [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 8,300,000 | 10,921,000 | 8,300,000 | 10,921,000 | 10,921,000
Intangible assets, accumulated amortization | (5,532,000) | (7,375,000) | (5,532,000) | (7,375,000) | (7,817,000)
Intangible assets, net (excluding goodwill) | $ 2,768,000 | $ 3,546,000 | $ 2,768,000 | $ 3,546,000 | $ 3,104,000

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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=56944662&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=26713463&loc=d3e16323-109275 + Details
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