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Stock-Based Compensation (Options Value Assumptions) (Details) (Stock Options, USD $)
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3 Months Ended |
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Mar. 31, 2015
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Stock Options
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Risk-free interest rate (percent) | 1.56% |
| Weighted average historical volatility (percent) | 37.50% |
| Dividend yield (percent) | 3.10% |
| Expected years until exercise (years) | 4 years 6 months |
| Forfeitures (percent) | 11.00% |
| Weighted average fair value of options granted (USD per share) | $ 28.37 |