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Significant Accounting Policies (Policy)
12 Months Ended
Dec. 31, 2011
Significant Accounting Policies [Abstract]  
Financial Statement Presentation
Change In Accounting Principle
Revenues
Cash And Cash Equivalents
Concentration Of Credit Risk
Property And Equipment
Fair Value
Goodwill And Indefinite-Lived Intangible Assets
Long-Term Liabilities
Accounting For Derivatives Instruments And Hedging Activities
Authorized Stock
Advertising Costs
Stock-Based Compensation
Net Income Per Share
Income Taxes
Use Of Estimates
Comprehensive Income
Reclassifications