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Summary of Significant Accounting Policies - Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]
Discount rates	25.00%
Customer attrition rates	20.00%
Intangible asset impairment charges		$ 1.1
Minimum
Indefinite-lived Intangible Assets [Line Items]
Discount rates			17.00%
Customer attrition rates			15.00%
Maximum
Indefinite-lived Intangible Assets [Line Items]
Discount rates			25.00%
Customer attrition rates			78.00%

X

- Definition

Fair Value Inputs, Customer Attrition Rates

+ References

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- Definition

Fair Value Inputs, Rate Of Return

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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

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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.

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