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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Tax Disclosure [Abstract]        
Adjust for AMT included in income tax provision     $ 900,000  
Income tax provision 210,000 (5,737,000) (987,000) (9,821,000)
AMT income subject to offset by available AMT NOLs     $ 48,700,000