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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Intangible asset amortization expense | $ 2.7 | $ 3.1
Customer contracts and relationships |  |
Segment Reporting Information [Line Items] |  |
Weighted-average amortization period of intangible assets | 8 years 3 months 18 days |
Operating contracts and licenses |  |
Segment Reporting Information [Line Items] |  |
Weighted-average amortization period of intangible assets | 26 years 1 month 6 days |
Tradenames |  |
Segment Reporting Information [Line Items] |  |
Weighted-average amortization period of intangible assets | 6 years 9 months 18 days |
Non-compete agreements |  |
Segment Reporting Information [Line Items] |  |
Weighted-average amortization period of intangible assets | 2 years |
Other |  |
Segment Reporting Information [Line Items] |  |
Weighted-average amortization period of intangible assets | 8 years 3 months 18 days |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the delivery of services. + 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=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Remaining amortization period 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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