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Income Tax Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Tax Expense [Abstract]        
Current Income Tax Expense (Benefit) $ (124) $ 0 $ 450 $ 0
Effective Income Tax Rate, Continuing Operations (2.00%)   2.00%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%   35.00%