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Income Taxes (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Disclosure [Abstract]    
Income tax (expense) benefit $ (611,000) $ 411,000
Effective Income Tax Rate, Continuing Operations 0.70% 55.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound $ 4,000,000