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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Advertising Costs | Advertising costs for the years ended December 31, 2012, 2011 and 2010, are reflected in the following table (in thousands):
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Advertising Costs |  | $ | 42,256 |  |  | $ | 42,728 |  |  | $ | 37,941 |
Depreciation Expense Computed Using Straight-Line Method over Useful Lives | Depreciation expense is computed using the straight-line method over the following useful lives:
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 Development Costs Capitalized | Internal-use software development costs capitalized for the years ended December 31, 2012, 2011 and 2010, are reflected in the following table (in thousands):
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Internal-use software development costs |  | $ | 19,083 |  |  | $ | 18,133 |  |  | $ | 10,512 |

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