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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	2.90%	3.30%	3.60%
Domestic production activities deduction	(2.60%)	(2.30%)	(3.20%)
Impact of Accounting Standard Update 2016-09	(0.90%)
Impact of Tax Cuts and Jobs Act on deferred taxes	(0.70%)
Other items	(0.90%)	(0.40%)
Effective income tax rate	32.80%	35.60%	35.40%

X

- Definition

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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