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Stock-Based Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-Based Compensation Expense $ 108 $ 92 $ 315 $ 266