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Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Abstract]
Statutory rate	21.00%	35.00%	21.00%	35.00%
State taxes, net of federal tax benefit	2.30%	1.70%	2.30%	1.70%
Foreign tax expense and tax rate differential	(0.20%)	(1.00%)	(0.20%)	(1.00%)
Tax benefit from stock option exercises	(1.40%)	(4.50%)	(4.80%)	(3.90%)
Expiration of the statute of limitations	(1.00%)	(2.60%)	(0.30%)	(0.90%)
Provision-to-return adjustment	(2.30%)	0.00%	(0.80%)	0.00%
Other, net	0.20%	(0.90%)	0.00%	(0.70%)
Effective income tax rate	18.60%	27.70%	17.20%	30.20%

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Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Abstract]

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

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Effective Income Tax Rate Reconciliation, Provision-To-Return Adjustment, 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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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