Stock Transactions and Stock-Based Compensation (Assumptions Used In The Black-Scholes Model To Value Options Granted) (Details)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Weighted average volatility | 22.40% | 23.60% | 30.10% |
Dividend yield | 0.50% | 0.20% | 0.20% |
Minimum | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Risk-free interest rate | 1.70% | 1.00% | 0.70% |
Expected years until exercise | 5 years 6 months | 6 years | 6 years |
Maximum | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Risk-free interest rate | 2.40% | 2.30% | 1.70% |
Expected years until exercise | 8 years | 8 years 6 months | 8 years 6 months |