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Share-Based Compensation (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Share-Based Compensation [Abstract] | ||||
| Share based compensation expense | $ 326,000 | $ 255,000 | $ 747,000 | $ 437,000 |
| Total unrecognized compensation expense | $ 2,300,000 | $ 2,300,000 | ||
| Estimated weighted average recognition period for unrecognized compensation expense | 2 years | |||