Stock Transactions and Stock-Based Compensation (Assumptions Used In The Black-Scholes Model To Value Options Granted) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average volatility	30.10%	28.00%	28.00%
Dividend yield	0.20%	0.20%	0.20%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.74%	1.17%	1.39%
Expected years until exercise	6 years	6 years	6 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.70%	3.19%	3.41%
Expected years until exercise	8 years 6 months	8 years 6 months	8 years 6 months