Income Taxes (Reconciliations Between Statutory And Effective Tax Rates) (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation Between Statutory And Effective Tax Rates [Abstract]
Federal statutory tax rate	21.00%	21.00%	35.00%
State statutory rates, net of federal benefits	3.70%	3.90%	3.10%
Adjustment for Tax Cuts and Jobs Act			(0.778)
Excess tax benefit related to stock-based compensation	(0.70%)	(0.40%)	(0.60%)
Deferred tax adjustments	(0.10%)	(0.60%)	0.40%
Other tax rate adjustments	(0.30%)	(1.00%)	(0.50%)
Effective tax rate	23.60%	22.90%	(40.40%)

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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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