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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
Stock-Based Compensation [Abstract] |  |  |  |
Options, Granted |  | 1,100 |  |
Options, Exercised |  | (12,933) |  |
Share Price |  | $ 28.95 | $ 27.05 | $ 27.45
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 12 months |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 40 |  |
Common Stock, Dividend Rate, Percentage | 10.00% | 10.00% |  |

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