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Share-Based Compensation (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Allocated Share-based Compensation Expense $ 1,111 $ 1,254 $ 2,461 $ 2,247
Long Term Cash Incentive Plan [Member]
       
Allocated Share-based Compensation Expense $ (155) $ 89 $ 70 $ 163