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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Restricted Stock Unit and Restricted Stock Award Activity Under Equity-Based Plans | The following table summarizes RSU and RSA activity under our equity-based plans for the three months ended March 31, 2019:
| RSUs | RSAs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2018 | 1,737,554 |  | $ | 32.83 |  | 346,792 |  | $ | 49.13 |
Granted | 669,415 |  | 60.43 |  | — |  | — |
Vested | (297,822 | ) | 28.83 |  | (13,565 | ) | 50.48 |
Forfeited | (14,908 | ) | 42.79 |  | (11,103 | ) | 49.35 |
Nonvested at March 31, 2019 | 2,094,239 |  | $ | 42.15 |  | 322,124 |  | $ | 49.20 |
Performance Stock Unit and Performance Stock Award Activity Under Equity-Based Plans | The following table summarizes RSU and RSA activity under our equity-based plans for the three months ended March 31, 2019:
| RSUs | RSAs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2018 | 1,737,554 |  | $ | 32.83 |  | 346,792 |  | $ | 49.13 |
Granted | 669,415 |  | 60.43 |  | — |  | — |
Vested | (297,822 | ) | 28.83 |  | (13,565 | ) | 50.48 |
Forfeited | (14,908 | ) | 42.79 |  | (11,103 | ) | 49.35 |
Nonvested at March 31, 2019 | 2,094,239 |  | $ | 42.15 |  | 322,124 |  | $ | 49.20 |
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) | 2019 | 2018
Cost of providing services | $ | 2 |  | $ | 2 |
Sales and marketing | 1 |  | 2 |
General and administrative | 5 |  | 4 |
Systems development and programming costs | 1 |  | 1 |
Total stock-based compensation expense | $ | 9 |  | $ | 9 |
Income tax benefit related to stock-based compensation expense | $ | 3 |  | $ | 2 |
Tax benefit realized from stock options exercise and similar awards | $ | 2 |  | $ | 6 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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