v2.4.0.6
Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2011
Agreement
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Income Taxes [Abstract]        
Percentage of actual tax liability to capital gain 100.00%      
Income taxes paid, net $ 41,200,000 $ 25,900,000 $ 234,600,000  
Tax liabilities 34,800,000 37,900,000    
Number of agreements terminated without liability 2      
Change in uncertain tax positions 9,000,000 11,800,000 3,700,000  
Income taxes paid for tax settlements 24,500,000      
Income Taxes (Textual) [Abstract]        
Recognized expense/benefit 21,579,000 21,724,000 29,262,000  
Recognized expense   11,800,000    
Recognized benefit   3,700,000    
Cash paid for income taxes, net of refunds 41,200,000 25,900,000 234,600,000  
Unrecognized tax liability, interest and penalties       85,400,000
Payment for closing agreement and settlement of state tax audits 24,500,000      
Accrued interest and penalties 26,400,000 43,700,000    
Accrued interest and penalties $ 26,400,000 $ 43,700,000