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Acquisitions, Goodwill and Other Long-Lived Assets Estimated Amortization Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 199,275 | $ 184,485
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] |  |
Year 2018 | 8,896 |
Year 2019 | 8,608 |
Year 2020 | 8,578 |
Year 2021 | 8,423 |
Year 2022 | 8,054 |
Finite-Lived Intangible Assets, Accumulated Amortization | 71,527 | 61,334
Impairment of Intangible Assets, Finite-lived | 16,501 | 16,501
Intangible Assets, Net (Excluding Goodwill) | 111,247 | 106,650
Customer Relationships [Member] |  |
Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | 193,209 | 179,575
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] |  |
Year 2018 | 8,399 |
Year 2019 | 8,319 |
Year 2020 | 8,319 |
Year 2021 | 8,177 |
Year 2022 | $ 7,976 |
Finite-Lived Intangible Asset, Useful Life | 15 years 10 months 11 days |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 66,986 | 57,390
Impairment of Intangible Assets, Finite-lived | 16,501 | 16,501
Intangible Assets, Net (Excluding Goodwill) | 109,722 | 105,684
Noncompete Agreements [Member] |  |
Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | 4,566 | 3,410
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] |  |
Year 2018 | 464 |
Year 2019 | 289 |
Year 2020 | 259 |
Year 2021 | 246 |
Year 2022 | $ 78 |
Finite-Lived Intangible Asset, Useful Life | 5 years 2 months 11 days |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 3,074 | 2,677
Intangible Assets, Net (Excluding Goodwill) | 1,492 | 733
Trade Names [Member] |  |
Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | 1,500 | 1,500
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] |  |
Year 2018 | 33 |
Year 2019 | 0 |
Year 2020 | 0 |
Year 2021 | 0 |
Year 2022 | $ 0 |
Finite-Lived Intangible Asset, Useful Life | 4 years 11 days |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 1,467 | 1,267
Intangible Assets, Net (Excluding Goodwill) | $ 33 | $ 233

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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 of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next 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=66006027&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 third 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=66006027&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=66006027&loc=d3e16323-109275 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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