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Stockholders' Deficit | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Stockholders' Deficit | Stockholders' Deficit Shares outstanding 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, 2017 and 2016:
|  | December 31,
|  | 2017 |  | 2016
Shares outstanding as of beginning of period |  | 88.0 |  |  | 86.5 |
Shares issued as part of equity-based compensation plans and the ESPP, net of shares surrendered |  | 1.9 |  |  | 1.5 |
Shares outstanding as of end of period |  | 89.9 |  |  | 88.0 |
Series C Junior Participating Preferred Stock and Rights Agreement On June 19, 2017, the Board of Directors of SGC approved, and SGC entered into, a rights agreement between SGC and American Stock Transfer & Trust Company, LLC (the "Rights Agreement"). Concurrently, the Board of Directors of SGC adopted a resolution reserving for issuance a series of 20,000 shares of preferred stock. On January 10, 2018, the Rights Agreement was amended and restated to account for the Reincorporation Merger (the “Amended and Restated Rights Agreement”). Pursuant to the Amended and Restated Rights Agreement, the preferred stock was designated as Series A Junior Participating Preferred Stock ("Junior Preferred Stock"), par value $.001 per share, upon the exercise of rights under the Amended and Restated Rights Agreement. The Amended and Restated Rights Agreement provides for a dividend of one preferred share purchase right (“Right”) for each share of Class A Common Stock, par value $0.01 per share, of SGC outstanding as of June 29, 2017. Each Right entitles the holder to purchase one ten-thousandth of a share of Junior Preferred Stock for a purchase price of $109.00, subject to adjustment as provided in the Amended and Restated Rights Agreement. As of December 31, 2017, none of these shares were outstanding and no Rights were exercised. Stock-based and other incentive compensation Pursuant to our incentive stock plans we offer stock-based compensation in the form of stock options and RSUs to employees and our non-employee directors. The terms of such stock option and RSU awards, including the vesting schedule of such awards, are determined at our discretion subject to the terms of the applicable equity-based compensation plan. Commencing on January 1, 2017, we also offer an ESPP. Our ESPP allow for a total of up to 2.0 million shares of Class A common stock to be purchased by eligible employees under offerings made each January 1 and July 1. Employees participate through payroll deductions up to a maximum of 15% of eligible compensation. The term of each offering period is six months and shares are purchased on the last day of the offering period at a 15% discount to the stock's market value. For offering period in 2017, we issued a total of 54 thousand shares of common stock at an average price of $30.63 per share. Options granted over the last several years have generally become exercisable in four equal installments beginning on the first anniversary of the date of grant or when certain performance targets are determined to have been met, in all cases, with a maximum term of ten years. RSUs typically vest in four equal installments beginning on the first anniversary of the date of grant or when certain performance targets are determined to have been met. We recognize expense for stock-based compensation plans based on the estimated fair value of the related awards in accordance with ASC 718. Stock options are granted with exercise prices that are not less than the fair market value of our Class A common stock on the date of grant. We periodically grant certain stock-based awards that are contingent upon SGC or certain of our subsidiaries achieving certain pre-determined financial performance targets. Upon determining that the performance target is probable, the fair value of the award is recognized over the service period. Determining the probability of achieving a performance target requires estimates and judgment. As of December 31, 2017, we had approximately 19.4 million shares of Class A common stock authorized for awards under the 2003 Incentive Compensation Plan, as amended and restated (the "2003 Plan") (plus available shares from a pre-existing equity-based compensation plan). As of December 31, 2017, we had approximately 3.6 million shares reserved under the 2003 Plan for future grants of equity awards and less than 0.1 million shares available under a pre-existing plan. As of December 31, 2017, we also had outstanding stock options and RSUs granted as part of inducement awards that were not approved by our stockholders, as permitted by applicable stock exchange rules. Stock options For the years ended December 31, 2017, 2016 and 2015, we recognized stock-based compensation expense of $3.7 million, $6.4 million and $2.2 million, respectively, related to the vesting of stock options. During 2017, we issued 0.7 million stock options with a weighted average exercise price of $22.17 and a total grant date fair value of $8.0 million. At December 31, 2017, we had $9.0 million of unrecognized stock-based compensation expense relating to approximately 1.8 million unvested stock options that will be amortized over a weighted-average period of approximately two years and have an average remaining contract term of 8.4 years with a weighted average exercise price of $14.11. During the year ended December 31, 2017, we received $8.7 million in cash from the exercise of stock options. Restricted stock units A summary of the changes in RSUs outstanding under our equity-based compensation plans during 2017 is presented below:
|  | Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested RSUs as of December 31, 2016 |  | 4.9 |  |  | $ | 11.68 |
Granted |  | 0.9 |  |  | $ | 22.55 |
Vested |  | (1.6 | ) |  | $ | 12.15 |
Cancelled |  | (0.3 | ) |  | $ | 16.25 |
Unvested RSUs as of December 31, 2017 |  | 3.9 |  |  | $ | 13.73 |
The weighted-average grant date fair value of RSUs granted during 2017 and 2016 was $22.55 and $9.35, respectively. The fair value of each RSU grant is based on the market value of our Class A common stock at the time of grant. During the years ended December 31, 2017, 2016 and 2015, we recognized stock-based compensation expense of $23.0 million, $28.8 million and $22.9 million, respectively, related to the vesting of RSUs. At December 31, 2017, we had $33.2 million of unrecognized stock-based compensation expense relating to unvested RSUs that will be amortized over a weighted-average period of approximately two years. The fair value at vesting date of RSUs vested during the years ended December 31, 2017, 2016 and 2015 was $47.1 million, $24.2 million and $19.2 million, respectively.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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