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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract] |
Components of accumulated other comprehensive income (loss) |
|  | 2012 |  |  | 2011 |
Net unrealized loss on marketable investments, net of taxes |  | $ | (1,024 | ) |  | $ | (1,021 | )
Cumulative translation adjustment |  |  | 1,612 |  |  |  | (5,807 | )
Total accumulated other comprehensive income (loss) |  | $ | 588 |  |  | $ | (6,828 | )
Stock-based compensation expense |
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Cost of services and fulfillment |  | $ | 3,085 |  |  | $ | 1,644 |  |  | $ | 2,094 |
Selling and marketing |  |  | 894 |  |  |  | 751 |  |  |  | 943 |
General and administrative |  |  | 1,418 |  |  |  | 1,247 |  |  |  | 1,837 |
Total |  | $ | 5,397 |  |  | $ | 3,642 |  |  | $ | 4,874 |
Options granted under the equity incentive plans and shares subject to the employee stock purchase plan valuation assumptions |
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Equity Incentive Plans |  |  | Employee Stock Purchase Plan |  |  | Equity Incentive Plans |  |  | Employee Stock Purchase Plan |  |  | Equity Incentive Plans |  |  | Employee Stock Purchase Plan |
Average risk-free interest rate |  |  | 0.85 | % |  |  | 0.14 | % |  |  | 1.25 | % |  |  | 0.13 | % |  |  | 1.93 | % |  |  | 0.17 | %
Expected dividend yield |  |  | 1.7 | % |  |  | 1.7 | % |  |  | None |  |  |  | None |  |  |  | None |  |  |  | None |
Expected life |  |  | 4.5 Years |  |  |  | 0.5 Years |  |  |  | 3.5 Years |  |  |  | 0.5 Years |  |  |  | 3.6 Years |  |  |  | 0.5 Years |
Expected volatility |  |  | 40 | % |  |  | 31 | % |  |  | 40 | % |  |  | 28 | % |  |  | 40 | % |  |  | 25 | %
Weighted average fair value |  | $ | 9.64 |  |  | $ | 6.90 |  |  | $ | 10.47 |  |  | $ | 7.55 |  |  | $ | 9.67 |  |  | $ | 6.38 |
Depreciation and amortization of property and equipment, useful life |
|  | Estimated
|  | Useful Life
Computers and equipment |  | 3 to 10 Years
Computer software |  | 3 to 5 Years
Furniture and fixtures |  | 7 Years
Leasehold improvements |  | Shorter of asset life or lease term
Amortization of intangible assets, useful life |
|  | Estimated Useful Life
Customer relationships |  | 5 to 11 Years
Research content |  | 1 to 2 Years
Technology |  | 7 Years
Trademarks |  | 1 Year
Backlog |  | 1 Year
Summary of basic and diluted weighted average common shares |
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic weighted average common shares outstanding |  |  | 22,500 |  |  |  | 22,666 |  |  |  | 22,478 |
Weighted average common equivalent shares |  |  | 429 |  |  |  | 498 |  |  |  | 585 |
Diluted weighted average common shares outstanding |  |  | 22,929 |  |  |  | 23,164 |  |  |  | 23,063 |

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