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Other intangible assets (Details 2) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, net (excluding goodwill) | $ 15,312,000 | $ 18,656,000 | $ 15,312,000 | $ 18,656,000 | $ 17,129,000
Amortization of intangible assets | 1,000,000 | 1,000,000 | 1,800,000 | 1,900,000 |
Estimated amortization expense for amortizable intangible assets [Abstract] |  |  |  |  |
2013 | 3,700,000 |  | 3,700,000 |  |
2014 | 3,500,000 |  | 3,500,000 |  |
2015 | 2,600,000 |  | 2,600,000 |  |
2016 | 2,200,000 |  | 2,200,000 |  |
2017 | 1,900,000 |  | 1,900,000 |  |
Thereafter | 3,200,000 |  | 3,200,000 |  |
Customer relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, gross | 21,310,000 | 21,010,000 | 21,310,000 | 21,010,000 | 21,310,000
Finite-lived intangible assets, accumulated amortization | (12,715,000) | (10,690,000) | (12,715,000) | (10,690,000) | (11,701,000)
Intangible assets, net (excluding goodwill) | 8,595,000 | 10,320,000 | 8,595,000 | 10,320,000 | 9,609,000
Noncompete agreements [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, gross | 6,186,000 | 7,086,000 | 6,186,000 | 7,086,000 | 7,236,000
Finite-lived intangible assets, accumulated amortization | (4,557,000) | (5,057,000) | (4,557,000) | (5,057,000) | (5,326,000)
Intangible assets, net (excluding goodwill) | 1,629,000 | 2,029,000 | 1,629,000 | 2,029,000 | 1,910,000
Other intangible assets [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, gross | 10,979,000 | 10,978,000 | 10,979,000 | 10,978,000 | 10,979,000
Finite-lived intangible assets, accumulated amortization | (5,891,000) | (4,671,000) | (5,891,000) | (4,671,000) | (5,369,000)
Intangible assets, net (excluding goodwill) | $ 5,088,000 | $ 6,307,000 | $ 5,088,000 | $ 6,307,000 | $ 5,610,000

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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 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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