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Stock-Based Compensation Plans (Summary of Activity Related to LTIP) (Details) (Long-Term Performance Share Plan [Member], USD $)
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12 Months Ended |
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Dec. 31, 2014
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Long-Term Performance Share Plan [Member]
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| Number of Shares | |
| Nonvested, beginning | 44,792 |
| Granted | 20,613 |
| Vested | 0 |
| Forfeited | (22,627) |
| Nonvested, ending | 42,778 |
| Weighted Average Grant Date Fair Value | |
| Nonvested, beginning | $ 35.78 |
| Granted | $ 41.18 |
| Vested | $ 0.00 |
| Forfeited | $ 34.77 |
| Nonvested, ending | $ 38.92 |