Employee Benefit Plans - Narrative (Details)	1 Months Ended
Sep. 30, 2017 employee
West Virginia, Virginia, and Ohio
Defined Benefit Plan Disclosure [Line Items]
Number of terminated employees	100

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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Balance Type:	na
Period Type:	duration