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Income Taxes (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Taxes (Textuals) [Abstract]
Effective tax rate (percent)	25.60%		40.20%	37.50%	38.50%
Unrecognized tax benefits from lapse of statute of limitations				$ 2,000,000
State and Local Jurisdiction | West Virginia
Income Taxes (Textuals) [Abstract]
Re-measurement in state deferred taxes	$ 126,000,000
State and Local Jurisdiction | Pennsylvania
Income Taxes (Textuals) [Abstract]
Decrease resulting from settlements with taxing authorities		$ 45,000,000
Unrecognized tax benefits that would impact effective tax rate	$ 0			$ 0

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Provision for Income Tax.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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