Stock-Based Compensation (Schedule Of Valuation Assumptions) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock-Based Compensation [Abstract]
Risk-free interest rate	1.70%	1.60%	1.50%
Expected volatility	36.00%	32.50%	38.60%
Expected term	5 years	5 years	5 years