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Summary Of Significant Accounting Policies (Policy)
12 Months Ended
Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]  
Nature Of Operations
Basis Of Presentation
Principles Of Consolidation
Use Of Estimates
Revenue Recognition
Costs Of Services
Advertising Costs
Comprehensive Income
Fair Value Of Financial Instruments
Cash And Cash Equivalents
Goodwill And Intangible Assets
Income Tax Assets And Liabilities
Workers' Compensation
Foreign Currency Translation
Stock-Based Compensation
Property And Equipment
Internal-Use Software