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Stock Based Compensation Stock Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 300,000     $ 1,300,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures       5,596,600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   98,800,000    
Share-based Compensation 5,019,000 3,716,000 17,106,000 15,115,000
Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unamortized Stock Based Compensation       1,200,000
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unamortized Stock Based Compensation       14,400,000
Share-based Compensation 3,600,000     10,100,000
Employee Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from Stock Options Exercised 300,000     10,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 100,000     5,900,000
Director [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from Stock Options Exercised       1,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       $ 30,000