Income Taxes (Reconciliation Of The Statutory Federal Income Tax Rate To The Effective Tax Rate) (Details)		12 Months Ended
Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent [Abstract]
State income taxes (net of federal income tax benefit)		1.10%	0.80%	0.90%
Foreign rate differential		(1.60%)	(1.40%)	(0.90%)
Resolution and expiration of statutes of limitation of uncertain tax positions		(0.70%)	(2.10%)	(1.70%)
Research credits, uncertain tax positions and other		0.70%	9.30%	0.30%
Excess tax benefits from stock-based compensation		(1.60%)	(1.20%)	(1.00%)
TCJA - revaluation of U.S. deferred income taxes		0.00%	0.00%	(1.60%)
TCJA - Transition Tax		0.00%	0.00%	1.80%
Effective income tax rate		18.90%	26.40%	18.80%

Effective Income Tax Rate Reconciliation, Revaluation of U.S. Deferred Incomes Taxes, Percent

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Effective Income Tax Rate Reconciliation, Transition Tax, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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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 statutory income tax expense (benefit) outside of the country of domicile.

+ References

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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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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