Income Taxes (Provision For Income Tax Rate To Statutory Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Provision at statutory rate	21.00%	35.00%	35.00%
State taxes, net of federal benefit	2.60%	1.90%	1.80%
Foreign rate differential	0.40%	(0.80%)	(0.60%)
Domestic manufacturing deduction	(0.00%)	(2.20%)	(2.10%)
Effective Income Tax Rate Reconciliation, Foreign Derived Intangible Income, Percent	(1.20%)	0.00%	0.00%
Research and development credit	(1.10%)	(0.70%)	(0.40%)
Unrecognized tax benefits including interest and penalties	(0.60%)	2.30%	(1.30%)
Valuation allowance adjustments	0.10%	(0.10%)	0.10%
Deferred tax balance remeasurement for rate change	(1.20%)	5.50%	(0.00%)
Territorial tax	1.40%	(0.10%)	0.00%
Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income, Percent	0.40%	0.00%	0.00%
Adjustments for previously accrued taxes	(1.00%)	(1.20%)	0.20%
Effective Income Tax Rate Reconciliation, Rate Differential on Intercompany Transfers, Percent	0.90%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation Limitation	0.50%	0.00%	0.00%
Other	0.40%	0.00%	(0.30%)
Provision for income taxes	22.60%	39.60%	32.40%