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Income Taxes (Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate									35.00%	35.00%	35.00%
State taxes, net of federal tax benefit									1.30%	1.30%	1.60%
Foreign tax expense and tax rate differential									(1.10%)	(0.80%)	(1.20%)
Tax benefit from stock option exercises									(3.90%)	0.00%	0.00%
Change in enacted tax rate									(4.90%)	0.00%	0.00%
Repatriation of foreign earnings									2.60%	0.00%	0.00%
Research and development tax credit									(0.90%)	(0.80%)	(0.60%)
Domestic Production Activities Deduction									(0.50%)	(0.60%)	(0.60%)
Settlement of state tax petition									0.00%	0.00%	(0.80%)
Other, net									(0.20%)	0.20%	0.30%
Effective income tax rate	19.90%	27.70%	32.10%	31.00%	33.40%	33.80%	35.20%	35.20%	27.40%	34.30%	33.70%

X

- Definition

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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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