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Stockholders' Deficit (Tables) | 12 Months Ended
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Dec. 31, 2016
Stockholders' Equity Note [Abstract] |
Schedule of change in the number of shares of Class A common stock | The following table sets forth the change in the number of shares of Class A common stock outstanding during the fiscal years ended December 31, 2016 and 2015:
|  | December 31,
|  | 2016 |  | 2015
Shares outstanding as of beginning of period |  | 86.5 |  |  | 85.1 |
Shares issued as part of equity-based compensation plans and the ESPP, net of shares surrendered |  | 1.5 |  |  | 1.4 |
Shares outstanding as of end of period |  | 88.0 |  |  | 86.5 |
RSUs outstanding under equity-based compensation plans | A summary of the changes in RSUs outstanding under our equity-based compensation plans during 2016 is presented below:
|  | Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested RSUs as of December 31, 2015 |  | 5.6 |  |  | $ | 13.05 |
Granted |  | 2.1 |  |  | $ | 9.35 |
Vested |  | (1.9 | ) |  | $ | 12.73 |
Cancelled |  | (0.9 | ) |  | $ | 12.63 |
Unvested RSUs as of December 31, 2016 |  | 4.9 |  |  | $ | 11.68 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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