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Share-Based Compensation (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Allocated Share-based Compensation Expense $ 1,122 $ 703 $ 3,583 $ 2,950
Long Term Cash Incentive Plan [Member]
       
Allocated Share-based Compensation Expense $ (105) $ (191) $ (35) $ (28)