Income Taxes (Reconciliation Of The Statutory Federal Income Tax Rate To The Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
Increase (decrease) in tax rate resulting from:
State income taxes (net of federal income tax benefit)	0.60%	0.70%	0.50%
Foreign income taxed at lower rate than U.S. statutory rate	(10.20%)	(17.10%)	(18.40%)
Resolution and expiration of statutes of limitation of uncertain tax positions	(3.10%)	(0.70%)	2.90%
Permanent foreign exchange losses	(8.20%)	(4.60%)	0.00%
Research credits, uncertain tax positions and other	3.40%	1.10%	1.50%
Effective income tax rate	17.50%	14.40%	21.50%