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Stock-based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2013
Stock Based Compensation Expense by Operating Expense | Stock-based compensation expense was included in the following operating expense categories as follows (in thousands):
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2012 |  |  | 2013 |  |  | 2012 |  |  | 2013 |
Service costs |  | $ | 1,545 |  |  | $ | 818 |  |  | $ | 554 |  |  | $ | 455 |
Sales and marketing |  |  | 2,008 |  |  |  | 474 |  |  |  | 153 |  |  |  | 211 |
Product development |  |  | 860 |  |  |  | 1,127 |  |  |  | 203 |  |  |  | 361 |
General and administrative |  |  | 7,982 |  |  |  | 4,456 |  |  |  | 2,792 |  |  |  | 1,338 |
Total stock-based compensation |  | $ | 12,395 |  |  | $ | 6,875 |  |  | $ | 3,702 |  |  | $ | 2,365 |
Income tax benefit related to stock-based compensation included in net income (loss) |  | $ | 3,750 |  |  | $ | 1,937 |  |  | $ | 1,088 |  |  | $ | 686 |
Assumptions to Estimate Fair Value for Stock Options at Grant Date | The following weighted average assumptions were used in determining the fair value of time-vested stock option grants for the periods presented:
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2012 |  |  | 2013 |  |  | 2012 |  |  | 2013 |
Expected life (in years) |  |  | 4.0-6.25 |  |  |  | 4.0-6.25 |  |  |  | 4.0 |  |  |  | 4.0-6.25 |
Risk-free interest rate |  |  | 0.60 | % |  |  | 1.09 | % |  |  | 0.47 | % |  |  | 1.52 | %
Expected volatility |  |  | 70 | % |  |  | 56 | % |  |  | 69 | % |  |  | 61 | %
Expected dividend yield |  |  | 2.00 | % |  |  | 1.74 | % |  |  | 3.11 | % |  |  | 1.00 | %
Summary of Stock Option Activity | Stock option activity during the nine months ended September 30, 2013 is summarized as follows:
|  | Shares |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term (in years) |  |  | Aggregate intrinsic value |
Balance at December 31, 2012 |  |  | 7,029,360 |  |  | $ | 7.67 |  |  |  | 6.28 |  |  | $ | 506 |
Options granted |  |  | 1,729,922 |  |  |  | 4.97 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | (269,792 | ) |  |  | 5.64 |  |  |  |  |  |  |  |  |
Options expired |  |  | (630,903 | ) |  |  | 5.82 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (206,299 | ) |  |  | 5.12 |  |  |  |  |  |  |  |  |
Balance at September 30, 2013 |  |  | 7,652,288 |  |  | $ | 7.35 |  |  |  | 6.72 |  |  | $ | 11,392 |
Summary of Restricted Stock Awards and Restricted Stock Units | Restricted stock awards and restricted stock units activity during the nine months ended September 30, 2013 is summarized as follows:
|  | Shares/ Units |  |  | Weighted average grant date fair value |
Unvested balance at December 31, 2012 |  |  | 2,563,511 |  |  | $ | 5.12 |
Granted |  |  | 1,093,724 |  |  |  | 4.20 |
Vested |  |  | (559,505 | ) |  |  | 4.13 |
Forfeited |  |  | (187,136 | ) |  |  | 4.90 |
Unvested balance at September 30, 2013 |  |  | 2,910,594 |  |  | $ | 4.98 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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 number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 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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