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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | 15. Stock-Based Compensation Stock Incentive Plan In April 2013, we adopted the 2013 Plan to provide for the granting of stock options, restricted stock, restricted stock units, stock appreciation rights, performance units, other stock-based awards and dividend equivalent rights to employees, directors and consultants of Archrock. The 2013 Plan is administered by the compensation committee of our board of directors. Under the 2013 Plan, the maximum number of shares of common stock available for issuance pursuant to awards is 10,100,000. Each option and stock appreciation right granted counts as one share against the aggregate share limit, and any share subject to a stock settled award other than a stock option, stock appreciation right or other award for which the recipient pays intrinsic value counts as 1.75 shares against the aggregate share limit. Shares subject to awards granted under the 2013 Plan that are subsequently canceled, terminated, settled in cash or forfeited (excluding shares withheld to satisfy tax withholding obligations or to pay the exercise price of an option) are, to the extent of such cancellation, termination, settlement or forfeiture, available for future grant under the 2013 Plan. Cash-settled awards are not counted against the aggregate share limit. No additional grants have been or may be made under the 2007 Plan following the adoption of the 2013 Plan. Previous grants made under the 2007 Plan will continue to be governed by that plan and the applicable award agreements. The compensation committee of our board of directors generally establishes its schedule for making annual long-term incentive awards, consisting of a combination of restricted shares and performance units vesting over multiple years, to our named executive officers several months in advance and does not make such awards based on knowledge of material nonpublic information. Although the compensation committee of our board of directors has historically granted awards on a regular, predictable cycle — after earnings information has been disseminated to the marketplace — such awards may be granted at other times during the year, as determined in the sole discretion of the compensation committee. Stock Options Stock options are granted at fair market value at the grant date, are exercisable according to the vesting schedule established by the compensation committee of our board of directors in its sole discretion and expire no later than seven years after the grant date. Stock options generally vest one-third per year on each of the first three anniversaries of the grant date, subject to continued service through the applicable vesting date. The following table presents stock option activity during the nine months ended September 30, 2018:
| Stock Options (in thousands) |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Life (in years) |  | Aggregate Intrinsic Value (in thousands)
Options outstanding, January 1, 2018 | 489 |  |  | $ | 12.28 |  |  |  |  |
Exercised | (30 | ) |  | 8.79 |  |  |  |  |  |
Canceled | (53 | ) |  | 13.96 |  |  |  |  |
Options outstanding and exercisable, September 30, 2018 | 406 |  |  | 12.31 |  |  | 0.8 |  | $ | 1,305 |
Intrinsic value is the difference between the market value of our stock and the exercise price of each stock option multiplied by the number of stock options outstanding for those stock options where the market value exceeds their exercise price. The total intrinsic value of stock options exercised during nine months ended September 30, 2018 was $0.1 million. Restricted Stock, Stock-Settled Restricted Stock Units, Performance Units, Cash-Settled Restricted Stock Units and Cash Settled Performance Units For grants of restricted stock, restricted stock units and performance units, we recognize compensation expense over the vesting period equal to the fair value of our common stock at the grant date. Our restricted stock, restricted stock units, and performance units include rights to receive dividends or dividend equivalents. We remeasure the fair value of cash-settled restricted stock units and cash-settled performance units and record a cumulative adjustment of the expense previously recognized. Our obligation related to the cash-settled restricted stock units and cash settled performance units is reflected as a liability in our condensed consolidated balance sheets. Restricted stock, stock-settled restricted stock units, cash-settled restricted stock units and cash-settled performance units generally vest one-third per year on dates as specified in the applicable award agreement, subject to continued service through the applicable vesting date. Stock-settled performance units cliff vest at the end of the performance period as specified in the terms of the applicable award agreement, subject to continued service through the applicable vesting date. The following table presents restricted stock, restricted stock unit, performance unit, cash-settled restricted stock unit and cash- settled performance unit activity during the nine months ended September 30, 2018:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value Per Share
Non-vested awards, January 1, 2018 | 1,440 |  |  | $ | 10.39 |
Granted | 1,148 |  |  | 9.66 |
Converted (1) | 140 |  |  | 7.03 |
Vested | (747 | ) |  | 10.46 |
Canceled | (219 | ) |  | 9.79 |
Non-vested awards, September 30, 2018 (2) | 1,762 |  |  | 9.69 |
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(1) | Reflects conversion of Partnership phantom units into Archrock restricted stock units pursuant to the Merger See “Partnership Long-Term Incentive Plan” section below for detail regarding the conversion of awards.
(2) | Non-vested awards as of September 30, 2018 are comprised of 216,000 cash-settled restricted stock units and cash-settled performance units and 1,546,000 restricted shares and stock-settled performance units.
As of September 30, 2018, we expect $13.2 million of unrecognized compensation cost related to unvested restricted stock, stock-settled restricted stock units, performance units, cash-settled restricted stock units and cash-settled performance units to be recognized over the weighted-average period of 2.3 years. Partnership Long-Term Incentive Plan In April 2017, the Partnership adopted the 2017 Partnership LTIP to provide for the benefit of employees, directors and consultants of the Partnership, us and our respective affiliates. The 2017 Partnership LTIP provided for the issuance of unit options, unit appreciation rights, restricted units, phantom units, performance awards, bonus awards, distribution equivalent rights, cash awards and other unit based awards. Previous grants made under the 2006 Partnership LTIP continued to be governed by the 2006 Partnership LTIP and the applicable award agreements. We recognized compensation expense over the vesting period equal to the fair value of the Partnership’s common units at the grant date. Phantom units granted under the 2017 and 2006 LTIP may include nonforfeitable tandem distribution equivalent rights to receive cash distributions on unvested phantom units in the quarter in which distributions are paid on common units. Phantom units generally vested one-third per year on dates as specified in the applicable award agreements subject to continued service through the applicable vesting date. During the nine months ended September 30, 2018, 53,091 phantom units vested with a weighted average grant date fair value per unit of $11.24. Pursuant to the Merger, all outstanding phantom units previously granted under the 2017 and 2006 Partnership LTIP were converted into comparable awards based on Archrock’s common shares. As such, all outstanding phantom units were converted, effective as of the closing of the Merger, into Archrock restricted stock units. See Note 17 (“Equity”) for further details regarding the Merger. Each Archrock restricted stock unit will be subject to the same vesting, forfeiture and other terms and conditions applicable to the converted Partnership phantom units. Under Accounting Standards Codification Topic 718, Compensation - Stock Compensation, we determined that there was no additional compensation cost to record as the conversion of awards did not result in incremental fair value.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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