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Share Based Compensation (Summary Of Option Plan) (Details) (USD $)
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9 Months Ended |
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Sep. 30, 2012
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| Share Based Compensation [Abstract] |
|
| Outstanding at beginning of period, Shares |
328,438 |
| Granted, Shares |
|
| Exercised, Shares |
|
| Forfeited, Shares |
(53,511) |
| Outstanding at end of period, Shares |
274,927 |
| Vested or expected to vest, Shares |
273,820 |
| Options exercisable at period end, shares |
250,327 |
| Outstanding at beginning of period, Weighted Average Exercise Price |
$ 16.17 |
| Granted, Weighted Average Exercise Price |
|
| Exercised, Weighted Average Exercise Price |
|
| Forfeited, Weighted Average Exercise Price |
$ 16.96 |
| Outstanding at end of period, Weighted Average Exercise Price |
$ 16.01 |
| Vested or expected to vest, Weighted Average Exercise Price |
$ 16.03 |
| Options exercisable at period end, Weighted Average Exercise Price |
$ 16.42 |
| Outstanding at end of period, Weighted Average Remaining Contractual Life |
2 years 6 months |
| Vested or expected to vest, Weighted Average Remaining Contractual Life |
2 years 6 months |
| Options exercisable at period end, Weighted Average Remaining Contractual Life |
2 years 6 months |
| Outstanding at end of period, Aggregate Intrinsic Value |
|
| Vested or expected to vest, Aggregate Intrinsic Value |
|
| Options exercisable at period end, Aggregate Intrinsic Value |
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