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STOCK-BASED COMPENSATION | 12 Months Ended
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Sep. 30, 2018
STOCK-BASED COMPENSATION |
STOCK-BASED COMPENSATION | NOTE 10 STOCK-BASED COMPENSATION On March 2, 2016, the Helmerich & Payne, Inc. 2016 Omnibus Incentive Plan (the “2016 Plan”) was approved by our stockholders. The 2016 Plan, among other things, authorizes the Human Resources Committee of the Board to grant non-qualified stock options and restricted stock awards to selected employees and to non-employee Directors. Restricted stock may be granted for no consideration other than prior and future services. The purchase price per share for stock options may not be less than market price of the underlying stock on the date of grant. Stock options expire 10 years after the grant date. Awards outstanding in the Helmerich & Payne, Inc. 2005 Long-Term Incentive Plan and the Helmerich & Payne, Inc. 2010 Long-Term Incentive Plan (collectively the “2010 Plan”) remain subject to the terms and conditions of those plans. During the fiscal year ended September 30, 2018, there were 693,873 non-qualified stock options and 411,977 shares of restricted stock awards granted under the 2016 Plan. An additional 213,904 of restricted stock grants were awarded outside of the 2016 Plan. A summary of compensation cost for stock-based payment arrangements recognized in general and administrative expense in fiscal years 2018, 2017 and 2016 is as follows:
|  | September 30,
|  | 2018 |  | 2017 |  | 2016
|  | (in thousands)
Compensation expense |  |  |  |  |  |  |  |  |
Stock options |  | $ | 7,913 |  | $ | 7,439 |  | $ | 8,290
Restricted stock |  |  | 23,774 |  |  | 18,744 |  |  | 16,093
|  | $ | 31,687 |  | $ | 26,183 |  | $ | 24,383
Stock Options Vesting requirements for stock options are determined by the Human Resources Committee of our Board of Directors. Options currently outstanding began vesting one year after the grant date with 25 percent of the options vesting for four consecutive years. We use the Black-Scholes formula to estimate the fair value of stock options granted to employees. The fair value of the options is amortized to compensation expense on a straight-line basis over the requisite service periods of the stock awards, which are generally the vesting periods. The weighted-average fair value calculations for options granted within the fiscal period are based on the following weighted-average assumptions set forth in the table below. Options that were granted in prior periods are based on assumptions prevailing at the date of grant.
|  | 2018 |  | 2017 |  | 2016 |
Risk-free interest rate (1) |  | 2.2 | % | 2.0 | % | 1.8 | %
Expected stock volatility (2) |  | 36.1 | % | 38.9 | % | 37.6 | %
Dividend yield (3) |  | 4.7 | % | 3.7 | % | 4.6 | %
Expected term (in years) (4) |  | 6.0 |  | 5.5 |  | 5.5 |
| (1) |  | The risk-free interest rate is based on U.S. Treasury securities for the expected term of the option.
| (2) |  | Expected volatilities are based on the daily closing price of our stock based upon historical experience over a period which approximates the expected term of the option.
| (3) |  | The dividend yield is based on our current dividend yield.
| (4) |  | The expected term of the options granted represents the period of time that they are expect to be outstanding. We estimate term of option granted based on historical experience with grants and exercise.
Based on these calculations, the weighted-average fair value per option granted to acquire a share of common stock was $13.17, $20.48 and $13.12 per share for fiscal years 2018, 2017 and 2016, respectively. The following summary reflects the stock option activity for our common stock and related information for fiscal years 2018, 2017 and 2016 (shares in thousands):
|  | 2018 |  | 2017 |  | 2016
|  |  |  | Weighted-Average |  |  |  | Weighted-Average |  |  |  | Weighted-Average
|  | Shares |  | Exercise Price |  | Shares |  | Exercise Price |  | Shares |  | Exercise Price
Outstanding at October 1, |  | 3,278 |  | $ | 56.41 |  | 3,312 |  | $ | 51.74 |  | 2,776 |  | $ | 48.51
Granted |  | 694 |  |  | 59.03 |  | 396 |  |  | 76.61 |  | 876 |  |  | 58.25
Exercised |  | (375) |  |  | 36.88 |  | (415) |  |  | 38.04 |  | (220) |  |  | 31.52
Forfeited/Expired |  | (98) |  |  | 70.77 |  | (15) |  |  | 68.32 |  | (120) |  |  | 61.80
Outstanding on September 30, |  | 3,499 |  | $ | 58.62 |  | 3,278 |  | $ | 56.41 |  | 3,312 |  | $ | 51.74
Exercisable on September 30, |  | 2,193 |  | $ | 56.31 |  | 2,167 |  | $ | 50.87 |  | 2,225 |  | $ | 46.66
Shares available to grant |  | 5,140 |  |  |  |  | 5,624 |  |  |  |  | 6,600 |  |  |
The following table summarizes information about stock options at September 30, 2018 (shares in thousands):
|  | Outstanding Stock Options |  | Exercisable Stock Options
|  |  |  | Weighted-Average |  | Weighted-Average |  |  |  | Weighted-Average
Range of Exercise Prices |  | Options |  | Remaining Life |  | Exercise Price |  | Options |  | Exercise Price
$0.00 to $21.07 |  | 180 |  | 0.2 |  | $ | 21.07 |  | 180 |  | $ | 21.07
$21.07 to $59.76 |  | 2,417 |  | 5.9 |  |  | 55.16 |  | 1,418 |  |  | 53.03
$59.76 to $68.83 |  | 358 |  | 6.3 |  |  | 68.66 |  | 275 |  |  | 68.83
$68.83 to $81.31 |  | 544 |  | 7.1 |  |  | 79.79 |  | 320 |  |  | 79.86
|  | 3,499 |  |  |  |  |  |  | 2,193 |  |  |
At September 30, 2018, the weighted-average remaining life of exercisable stock options was 4.36 years and the aggregate intrinsic value was $30.9 million with a weighted-average exercise price of $56.31 per share. The number of options vested or expected to vest at September 30, 2018 was 1,306,087 with an aggregate intrinsic value of $10.6 million and a weighted-average exercise price of $62.49 per share. As of September 30, 2018, the unrecognized compensation cost related to the stock options was $7.3 million. That cost is expected to be recognized over a weighted-average period of 2.3 years. The total intrinsic value of options exercised during fiscal years 2018, 2017 and 2016 was $9.9 million, $13.1 million and $6.3 million, respectively. The grant date fair value of shares vested during fiscal years 2018, 2017 and 2016 was $8.8 million, $6.7 million and $9.6 million, respectively. Restricted Stock Restricted stock awards consist of our common stock and are time-vested over three to six years. We recognize compensation expense on a straight-line basis over the vesting period. The fair value of restricted stock awards is determined based on the closing price of our shares on the grant date. As of September 30, 2018, there was $34.4 million of total unrecognized compensation cost related to unvested restricted stock awards. That cost is expected to be recognized over a weighted-average period of 2.4 years. A summary of the status of our restricted stock awards as of September 30, 2018, and of changes in restricted stock outstanding during the fiscal years ended September 30, 2018, 2017 and 2016, is as follows (shares in thousands):
|  | 2018 |  | 2017 |  | 2016
|  |  |  | Weighted-Average |  |  |  | Weighted-Average |  |  |  | Weighted-Average
|  |  |  | Grant Date Fair |  |  |  | Grant Date Fair |  |  |  | Grant Date Fair
|  | Shares |  | Value per Share |  | Shares |  | Value per Share |  | Shares |  | Value per Share
Outstanding at October 1, |  | 659 |  | $ | 70.76 |  | 648 |  | $ | 64.24 |  | 668 |  | $ | 67.03
Granted |  | 626 |  |  | 59.53 |  | 292 |  |  | 78.69 |  | 294 |  |  | 58.25
Vested (1) |  | (258) |  |  | 70.60 |  | (271) |  |  | 63.81 |  | (256) |  |  | 64.75
Forfeited |  | (26) |  |  | 66.73 |  | (10) |  |  | 68.09 |  | (58) |  |  | 63.65
Outstanding on September 30, |  | 1,001 |  | $ | 63.74 |  | 659 |  | $ | 70.76 |  | 648 |  | $ | 64.24
| (1) |  | The number of restricted stock awards vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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