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Income Taxes (Reconciliation of Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	3.40%	3.40%	3.20%
Valuation allowance	0.10%	(2.60%)	(1.00%)
Enactment of the Tax Cuts and Jobs Act	(8.00%)	0.00%	0.00%
Domestic manufacturing deduction	(1.00%)	7.60%	(3.60%)
State rate and other changes in deferred taxes	(1.30%)	(1.90%)	0.40%
Federal and state credits	0.10%	(4.80%)	(2.70%)
Uncertain tax positions	(0.30%)	(16.10%)	0.40%
Nondeductible expenses and other	0.20%	1.30%	0.10%
Effective income tax rate	28.20%	21.90%	31.80%

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Effective Income Tax Rate Reconciliation, Change in Enactment Of The Tax Cuts And Jobs Act, 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 expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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