v2.4.0.6
Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Legal Entity [Line Items]          
Income Tax Expense (Benefit) $ 26,857,000 $ 11,235,000 $ 128,297,000 $ 9,503,000  
(Loss) income before provision for income taxes 25,917,000 (3,181,000) 157,313,000 (228,580,000)  
Effective Income Tax Rate, Continuing Operations 103.60% (353.20%) 81.60% (4.20%)  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate     35.00%    
Unrecognized Tax Benefits, Period Increase (Decrease)     10,100,000    
Unrecognized Tax Benefits that Would Impact Income Tax Expense     $ 24,800,000   $ 3,200,000