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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract] |
Advertising Costs |
|  | Years Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Advertising Costs |  | $ | 42,728 |  |  | $ | 37,941 |  |  | $ | 32,242 |
Property And Equipment |
Computer hardware |  | 2 to 3 years
Computer software |  | 2 to 5 years
Furniture and equipment |  | 5 years
Leasehold improvements |  | Term of lease, 5 years maximum
Internal-Use Software |
|  | Years Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Internal-use software development costs |  | $ | 18,133 |  |  | $ | 10,512 |  |  | $ | 16,655 |

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- Details
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