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Other intangible assets (Details 2) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, net (excluding goodwill) | $ 10,596,000 | $ 14,092,000 | $ 10,596,000 | $ 14,092,000 | $ 13,099,000
Amortization of intangible assets | 700,000 | 1,200,000 | 2,500,000 | 3,000,000 |
Estimated amortization expense for amortizable intangible assets [Abstract] |  |  |  |  |
2014 | 3,300,000 |  | 3,300,000 |  |
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 |  |
Thereafter | 2,200,000 |  | 2,200,000 |  |
Customer relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 21,310,000 | 21,310,000 | 21,310,000 | 21,310,000 | 21,310,000
Intangible assets, accumulated amortization | (15,116,000) | (13,221,000) | (15,116,000) | (13,221,000) | (13,726,000)
Intangible assets, net (excluding goodwill) | 6,194,000 | 8,089,000 | 6,194,000 | 8,089,000 | 7,584,000
Noncompete agreements [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 5,080,000 | 6,186,000 | 5,080,000 | 6,186,000 | 6,186,000
Intangible assets, accumulated amortization | (4,021,000) | (4,706,000) | (4,021,000) | (4,706,000) | (4,840,000)
Intangible assets, net (excluding goodwill) | 1,059,000 | 1,480,000 | 1,059,000 | 1,480,000 | 1,346,000
Other intangible assets [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 10,921,000 | 10,995,000 | 10,921,000 | 10,995,000 | 10,995,000
Intangible assets, accumulated amortization | (7,578,000) | (6,472,000) | (7,578,000) | (6,472,000) | (6,826,000)
Intangible assets, net (excluding goodwill) | $ 3,343,000 | $ 4,523,000 | $ 3,343,000 | $ 4,523,000 | $ 4,169,000

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 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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- 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&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=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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