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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Stock Option Activity Under Equity-Based Plans | The following table summarizes stock option activity under our 2009 Plan for the three months ended March 31, 2018:
| Number of Shares
Balance at December 31, 2017 | 1,296,863 |
Exercised | (206,430 | )
Forfeited | (4,167 | )
Balance at March 31, 2018 | 1,086,266 |
Exercisable at March 31, 2018 | 1,011,038 |
Restricted Stock Unit and Restricted Stock Award Activity Under Equity-Based Plans | The following tables summarize restricted stock unit (RSU), performance-based restricted stock unit (PSU), RSA, and PRSA activity under our 2009 Plan for the three months ended March 31, 2018:
| RSUs | PSUs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | 2,249,661 |  | $ | 24.83 |  | 453,674 |  | $ | 30.72 |
Granted | 548,054 |  | 46.97 |  | 23,842 |  | 47.61 |
Vested | (286,121 | ) | 23.96 |  | (82,066 | ) | 33.51 |
Forfeited | (88,396 | ) | 25.51 |  | — |  | — |
Nonvested at March 31, 2018 | 2,423,198 |  | $ | 29.91 |  | 395,450 |  | $ | 30.89 |
| RSAs | PRSAs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | — |  | $ | — |  | — |  | $ | — |
Granted | 72,991 |  | 47.61 |  | 169,088 |  | 47.61 |
Nonvested at March 31, 2018 | 72,991 |  | $ | 47.61 |  | 169,088 |  | $ | 47.61 |
Performance Stock Unit and Performance Stock Award Activity Under Equity-Based Plans | The following tables summarize restricted stock unit (RSU), performance-based restricted stock unit (PSU), RSA, and PRSA activity under our 2009 Plan for the three months ended March 31, 2018:
| RSUs | PSUs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | 2,249,661 |  | $ | 24.83 |  | 453,674 |  | $ | 30.72 |
Granted | 548,054 |  | 46.97 |  | 23,842 |  | 47.61 |
Vested | (286,121 | ) | 23.96 |  | (82,066 | ) | 33.51 |
Forfeited | (88,396 | ) | 25.51 |  | — |  | — |
Nonvested at March 31, 2018 | 2,423,198 |  | $ | 29.91 |  | 395,450 |  | $ | 30.89 |
| RSAs | PRSAs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | — |  | $ | — |  | — |  | $ | — |
Granted | 72,991 |  | 47.61 |  | 169,088 |  | 47.61 |
Nonvested at March 31, 2018 | 72,991 |  | $ | 47.61 |  | 169,088 |  | $ | 47.61 |
Stock-based Compensation Expense | Stock-based compensation expense and other disclosures for stock-based awards made to our employees pursuant to the equity plans was as follows:
| Three Months Ended March 31,
(in millions) | 2018 | 2017
Cost of providing services | $ | 2 |  | $ | 2 |
Sales and marketing | 2 |  | 1 |
General and administrative | 4 |  | 2 |
Systems development and programming costs | 1 |  | 1 |
Total stock-based compensation expense | $ | 9 |  | $ | 6 |
Income tax benefit related to stock-based compensation expense | $ | 2 |  | $ | 2 |
Tax benefit realized from stock options exercised and similar awards | $ | 6 |  | $ | 6 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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