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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Income Tax Contingency [Line Items]        
Effective income tax rate 38.29% [1] 34.86% [1] 38.89%  
Reduction in its income tax provision resulting from the resolution of the tax matters   $ 10,900,000    
Excess tax benefits related to stock-based awards, which increased the cash flow from financing activities 7,100,000 3,000,000 6,900,000  
Net operating loss carryforwards for federal and state tax 9,400,000 20,700,000 8,000,000  
Decrease in net operating loss carryforward for federal and state 11,300,000      
Increase in net operating loss carryforward for federal and state   12,700,000    
Accounts payable and accrued expenses 3,242,000 10,948,000    
Other liabilities 21,700,000 19,700,000    
Liability for uncertain tax positions deferred taxes payable   19,000,000    
Liability for uncertain tax positions related to resolution of certain matters with taxing authorities   9,600,000    
Interest and penalties related to income tax liabilities 400,000 1,700,000 2,500,000  
Company's accrued liability for interest and penalties related to income tax liabilities 8,700,000 8,300,000    
Decrease in uncertain tax position 6,100,000 27,100,000    
Increase in uncertain tax position 1,000,000      
Liability for uncertain tax positions reduced over next 12 months 3,500,000      
Uncertain tax positions recognized would favorably impact its effective tax rate 13,200,000      
Company's total liability for uncertain tax positions 16,165,000 22,290,000 49,416,000 47,562,000
Other Liabilities [Member] | Accounts Payable And Accrued Expenses [Member]
        
Income Tax Contingency [Line Items]        
Company's total liability for uncertain tax positions $ 24,900,000 $ 30,600,000    
[1] The comparison of net income is affected by the change in the effective tax rate. The effective tax rate was 38.29% for the year ended December 31, 2011 as compared to 34.29% for the year ended December 31, 2010.