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Income Taxes (Reconciliation of Statutory Federal Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Federal income tax at statutory rate	21.00%	21.00%	21.00%
State and local taxes, net of federal benefit	6.00%	6.40%	6.30%
Jobs tax credits, net	(5.10%)	(8.30%)	(10.70%)
162(m) disallowance for executive compensation	6.00%	7.50%	4.50%
Nondeductible permanent items	0.40%	0.70%	2.20%
Nondeductible penalties		1.30%
Excess tax benefit	(5.60%)	(6.70%)	(2.70%)
Federal/state return to provision	(1.60%)	0.60%	0.20%
Other	(0.10%)	(0.30%)	(0.70%)
Effective income tax rate	21.00%	22.20%	20.10%

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Effective income tax rate reconciliation, federal/state return to provision (benefit), 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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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 nondeductible expenses.

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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