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Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	21.00%	21.00%
State taxes, net of federal tax benefit	2.60%	2.30%	2.60%	2.30%
Foreign tax expense and tax rate differential	(0.30%)	(0.20%)	(0.20%)	(0.20%)
Tax benefit from stock option exercises	(2.20%)	(1.40%)	(1.50%)	(4.80%)
Expiration of the statute of limitations	(1.20%)	(1.00%)	(0.40%)	(0.30%)
Provision-to-return adjustment	(0.60%)	(2.30%)	(0.20%)	(0.80%)
Other, net	(0.40%)	0.20%	(0.30%)	0.00%
Effective income tax rate	18.90%	18.60%	21.00%	17.20%

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Effective Income Tax Rate Reconciliation, Expiration Of The Statute Of Limitations

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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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