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Share-Based Payments (Summary of Stock Options Exercised) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Share-Based Payments [Abstract]    
Proceeds from exercise of options $ 416 $ 958
Tax benefits 55   
Intrinsic value of stock options exercised $ 154 $ 708