ÀÖÌìÌÃfun88(ÖйúÇø)¹Ù·½ÍøÕ¾

17. STOCK‑BASED COMPENSATION PLANS

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On May 5, 2016, our stockholders approved a new ÀÖÌìÌÃfun88(ÖйúÇø)¹Ù·½ÍøÕ¾ Corporation 2016 Stock Incentive Plan (the â€�2016 Stock Incentive Planâ€�), which reserved 8.2 million shares for issuance. The ÀÖÌìÌÃfun88(ÖйúÇø)¹Ù·½ÍøÕ¾ Corporation Stock Incentive Plan, as amended and restated (the “Prior Planâ€�), remains in effect for outstanding awards granted pursuant to the Prior Plan, but no further awards may be granted under the Prior Plan. Under the 2016 Stock Incentive Plan we may grant nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, phantom stock, performance share units and other stock-based awards to our employees, directors and consultants and to employees and consultants of our subsidiaries, provided that incentive stock options may be granted solely to employees. The terms of the grants under both the 2016 Stock Incentive Plan and the Prior Plan are fixed at the grant date. Initially, there were approximately 8.2 million shares available for issuance under the 2016 Stock Incentive Plan. However, the number of shares available for issuance may be adjusted to include any shares surrendered, exchanged, forfeited or settled in cash pursuant to the Prior Plan. As of March 31, 2019, we had approximately 8Ìýmillion shares remaining under the 2016 Stock Incentive Plan available for grant. Option awards have a maximum contractual term of 10Ìýyears and generally must have an exercise price at least equal to the market price of our common stock on the date the option award is granted. Outstanding stock-based awards generally vest annually over a three-year period.

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The compensation cost from continuing operations under the 2016 Stock Incentive Plan and the Prior Plan for our Company and ÀÖÌìÌÃfun88(ÖйúÇø)¹Ù·½ÍøÕ¾ International were as follows (dollars in millions):

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The total income tax benefit recognized in the condensed consolidated statements of operations for us and ÀÖÌìÌÃfun88(ÖйúÇø)¹Ù·½ÍøÕ¾ International for stock-based compensation arrangements was $5 million and $4Ìýmillion for the three months ended March 31, 2019 and 2018, respectively.

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Stock Options

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The fair value of each stock option award is estimated on the date of grant using the Black‑Scholes valuation model that uses the assumptions noted in the following table. Expected volatilities are based on the historical volatility of our common stock through the grant date. The expected term of options granted was estimated based on the contractual term of the instruments and employees� expected exercise and post‑vesting employment termination behavior. The risk‑free rate for periods within the contractual life of the option was based on the U.S. Treasury yield curve in effect at the time of grant. The assumptions noted below represent the weighted average of the assumptions utilized for stock options granted during the periods.

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A summary of stock option activity under the 2016 Stock Incentive Plan and the Prior Plan as of March 31, 2019 and changes during the three months then ended is presented below:

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The weighted‑average grant‑date fair value of stock options granted during the three months ended March 31, 2019 was $9.27 per option. As of March 31, 2019, there was $14 million of total unrecognized compensation cost related to nonvested stock option arrangements granted under the 2016 Stock Incentive Plan and the Prior Plan. That cost is expected to be recognized over a weighted-average period of approximately 2.3 years.

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The total intrinsic value of stock options exercised during the three months ended March 31, 2019 and 2018 was approximatelyÌý$1 million andÌý$17 million, respectively. Cash received from stock options exercised during the three months ended March 31, 2019 and 2018 was approximately $1 million and $6 million, respectively. The cash tax benefit from stock options exercised during the three months ended March 31, 2019 and 2018 was approximately nil and $3 million, respectively.

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Nonvested Shares

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Nonvested shares granted under the 2016 Stock Incentive Plan and the Prior Plan consist of restricted stock and performance share unit awards, which are accounted for as equity awards, and phantom stock, which is accounted for as a liability award because it can be settled in either stock or cash.

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The fair value of each performance share unit award is estimated using a Monte Carlo simulation model that uses various assumptions, including an expected volatility rate and a risk-free interest rate. For the three months ended March 31, 2019 and 2018, the weighted-average expected volatility rate was 34.6% and 44.3%, respectively, and the weighted average risk-free interest rate was 2.5% and 2.3%, respectively. For the performance share unit awards granted in the three months ended March 31, 2019 and 2018, the number of shares earned varies based upon the Company achieving certain performance criteria over a Ìýthree-year performance period. The performance criteria are total stockholder return of our common stock relative to the total stockholder return of a specified industry peer group for the three-year performance periods.

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A summary of the status of our nonvested shares as of March 31, 2019 and changes during the three months then ended is presented below:

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As of March 31, 2019, there was $36Ìýmillion of total unrecognized compensation cost related to nonvested share compensation arrangements granted under the 2016 Stock Incentive Plan and the Prior Plan. That cost is expected to be recognized over a weighted‑average period of approximately 1.7 years. The value of share awards that vested during the three months ended March 31, 2019 and 2018 was $23Ìýmillion and $22Ìýmillion, respectively.