Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details)	12 Months Ended
Dec. 31, 2018
Goodwill
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Operational forecast period used in fair value inputs	3 years

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.

No definition available.

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