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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	4.00%	2.90%	3.30%
Domestic production activities deduction		(2.60%)	(2.30%)
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%	(0.90%)	(0.40%)
Effective income tax rate	25.90%	32.80%	35.60%

X

- Definition

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

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