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Income Taxes (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income Taxes (Textual) [Abstract]          
Income tax benefit $ 44,213,000 $ (6,089,000) $ 39,719,000 $ (11,282,000)  
Effective income tax rate 28.70%   27.80%    
Federal statutory rate 35.00%   35.00%    
Interest or penalties accrued 200,000   200,000   0
Goodwill and other intangible asset impairment loss 165,336,000 0 165,336,000 0  
Tax benefit 48,700,000   48,700,000    
Effective tax rate of tax benefit due to impairment loss 29.40%   29.50%    
Income tax expense excluding impact of impairment charges $ 4,400,000   $ 8,900,000    
Effective tax rate excluding impact of impairment charges 38.90%   39.40%    
Income tax examination, description     The company is no longer subject to tax examinations for years prior to 2007