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Equity-Based Compensation (Fair Value Of Performance Share Awards) (Details) (Performance shares [Member], USD $)
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9 Months Ended | |
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Sep. 30, 2014
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Sep. 30, 2013
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Performance shares [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Shares granted (in shares) | 87,441 | 83,111 |
| Stock price as of valuation date (in dollars per share) | $ 39.76 | $ 45.31 |
| Risk-free rate | 0.72% | 0.40% |
| Fair value of a performance share (in dollars per share) | $ 45.57 | $ 62.78 |