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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2013
Equity [Abstract] |
Summary of Stock Option Activity | Stock option activity for the nine months ended September 30, 2013 is presented below (in thousands, except per share data):
|  | Number of Shares |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted - Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2012 |  |  | 1,936 |  |  | $ | 29.03 |  |  |  |  |  |  |  |  |
Granted |  |  | 489 |  |  |  | 35.20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (524 | ) |  |  | 25.46 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (69 | ) |  |  | 32.05 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2013 |  |  | 1,832 |  |  | $ | 31.58 |  |  |  | 7.11 |  |  | $ | 9,592 |
Exercisable at September 30, 2013 |  |  | 866 |  |  | $ | 28.73 |  |  |  | 5.14 |  |  | $ | 6,995 |
Details of Restricted Stock Unit Activity | Restricted stock unit activity for the nine months ended September 30, 2013 is presented below (in thousands, except per share data):
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Unvested at December 31, 2012 |  |  | 301 |  |  | $ | 32.98 |
Granted |  |  | 207 |  |  |  | 34.58 |
Vested or settled |  |  | (67 | ) |  |  | 32.91 |
Forfeited |  |  | (56 | ) |  |  | 31.02 |
Unvested at September 30, 2013 |  |  | 385 |  |  | $ | 34.14 |
Summary of Stock-Based Compensation Recorded in Expense Categories | Stock-based compensation was recorded in the following expense categories (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Cost of services and fulfillment |  | $ | 1,061 |  |  | $ | 835 |  |  | $ | 2,708 |  |  | $ | 2,213 |
Selling and marketing |  |  | 321 |  |  |  | 207 |  |  |  | 893 |  |  |  | 638 |
General and administrative |  |  | 478 |  |  |  | 367 |  |  |  | 987 |  |  |  | 1,070 |
Total |  | $ | 1,860 |  |  | $ | 1,409 |  |  | $ | 4,588 |  |  | $ | 3,921 |
Assumptions for Valuation of Options Granted under Equity Incentive Plans and Shares Subject to Purchase under Employee Stock Purchase Plan | Options granted under the equity incentive plans and shares subject to purchase under the employee stock purchase plan were valued using the following assumptions:
|  | Three Months Ended September 30, 2013 |  |  | Three Months Ended September 30, 2012 |
|  | Equity Incentive Plans |  |  | Employee Stock Purchase Plan |  |  | Equity Incentive Plans |  |  | Employee Stock Purchase Plan |
Average risk-free interest rate |  |  | 1.40 | % |  |  | 0.08 | % |  |  | 0.62 | % |  |  | 0.14 | %
Expected dividend yield |  |  | 2.1 | % |  |  | 2.1 | % |  |  | 1.7 | % |  |  | 1.7 | %
Expected life |  |  | 4.9 Years |  |  |  | 0.5 Years |  |  |  | 4.5 Years |  |  |  | 0.5 Years |
Expected volatility |  |  | 36 | % |  |  | 19 | % |  |  | 40 | % |  |  | 31 | %
Weighted average fair value |  | $ | 9.94 |  |  | $ | 6.02 |  |  | $ | 9.42 |  |  | $ | 6.89 |
|  | Nine Months Ended September 30, 2013 |  |  | Nine Months Ended September 30, 2012 |
|  | Equity Incentive Plans |  |  | Employee Stock Purchase Plan |  |  | Equity Incentive Plans |  |  | Employee Stock Purchase Plan |
Average risk-free interest rate |  |  | 0.81 | % |  |  | 0.08 | % |  |  | 0.87 | % |  |  | 0.14 | %
Expected dividend yield |  |  | 2.1 | % |  |  | 2.1 | % |  |  | 1.7 | % |  |  | 1.7 | %
Expected life |  |  | 4.9 Years |  |  |  | 0.5 Years |  |  |  | 4.5 Years |  |  |  | 0.5 Years |
Expected volatility |  |  | 37 | % |  |  | 19 | % |  |  | 40 | % |  |  | 31 | %
Weighted average fair value |  | $ | 9.15 |  |  | $ | 6.02 |  |  | $ | 9.81 |  |  | $ | 6.87 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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