Income Taxes - Effective Tax Rate Differs from Statutory United States Federal Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory Rate	21.00%	35.00%	35.00%
Increases (Decreases) in United States Federal Taxes
State Income Taxes, net of Federal Income Tax Benefit	4.00%	2.70%	2.60%
Effective Income Tax Rate Reconciliation, Other Permanent Differences, Percent	(1.20%)	(0.00%)	(0.00%)
Federal Tax Credits	(0.50%)	(0.80%)	(1.10%)
Change in Valuation Allowance	(0.00%)	(0.40%)	(0.00%)
Remeasurement of net Deferred Tax Liabilities	(0.20%)	(58.20%)	(0.00%)
Other, net	(0.90%)	(0.40%)	(0.30%)
Effective Tax Rate	22.20%	(22.10%)	36.20%

Effective Income Tax Rate Reconciliation, Increases Decreases [Abstract]

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Effective Income Tax Rate Reconciliation, Other Permanent Differences, Percent

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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