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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | 12. Stock-Based Compensation Stock Incentive Plan In April 2013, we adopted the Archrock, Inc. 2013 Stock Incentive Plan (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. 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 to or pay the exercise price of an option) are, to the extent of such cancelation, 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 may be made under the Archrock, Inc. 2007 Amended and Restated Stock Incentive Plan (the “2007 Plan”). Previous grants made under the 2007 Plan will continue to be governed by that plan. Exterran Corporation Spin-off Adjustments In connection with the Spin-off of Exterran Corporation, stock options, restricted stock, restricted stock units and performance unit awards were adjusted in accordance with anti-dilution provisions under the existing plans. As such, we did not record any additional compensation expense related to the adjustment of the awards. The awards were generally adjusted as follows:
• | Pre-2015 Awards. Immediately prior to the Spin-off, each outstanding Exterran Holdings, Inc. (“Exterran Holdings”) stock option, restricted stock, restricted stock unit and performance unit granted prior to January 1, 2015, whether vested or unvested, was split into two awards, consisting of an Archrock award and an Exterran Corporation award. However, Exterran Holdings “incentive stock options” (within the meaning of Section 422 of the Code) were converted solely, into options denominated in shares of common stock of the applicable holder’s post-spin employer if the holder of the award elected, prior to the Spin-off, to preserve the tax treatment of such option.
• | 2015 Awards. Each Exterran Holdings stock option, restricted stock award, restricted stock unit award and performance unit award that was (i) granted in calendar year 2015 and (ii) held by an individual who became our employee or is engaged to provide service to us following the Spin-off was converted solely into an Archrock award. We did not grant any stock options in the calendar year 2015 prior to the Spin-off.
Equity awards that were adjusted as described above generally remain subject to the same vesting, expiration, performance conditions and other terms and conditions as applied to the awards immediately prior to the Spin-off. 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 services through the applicable vesting date. The following table presents stock option activity during the six months ended June 30, 2016:
| 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, 2016 | 1,247 |  |  | $ | 18.28 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Cancelled | (494 | ) |  | 20.35 |  |  |  |  |
Options outstanding, June 30, 2016 | 753 |  |  | 16.92 |  |  | 2.5 |  | $ | 733 |
Options exercisable, June 30, 2016 | 722 |  |  | 16.55 |  |  | 2.4 |  | 733 |
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. As of June 30, 2016, we expect $0.2 million of unrecognized compensation cost related to unvested stock options to be recognized over the weighted-average period of 0.7 years. 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 and certain of our stock-settled 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, performance units, cash-settled restricted stock units and performance units generally vest one-third per year on each of the first three anniversaries of the grant date, subject to continued services 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 six months ended June 30, 2016:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value Per Share
Non-vested awards, January 1, 2016 | 1,155 |  |  | $ | 18.50 |
Granted | 1,357 |  |  | 6.09 |
Vested | (601 | ) |  | 16.48 |
Cancelled | (64 | ) |  | 11.40 |
Non-vested awards, June 30, 2016 (1) | 1,847 |  |  | 10.29 |
(1) | Non-vested awards as of June 30, 2016 are comprised of 270,000 cash-settled restricted stock units and cash-settled performance units and 1,577,000 restricted shares and stock-settled restricted stock units.
As of June 30, 2016, we expect $14.5 million of unrecognized compensation cost related to unvested restricted stock, stock-settled restricted stock units, cash-settled restricted stock units and cash-settled performance units to be recognized over the weighted-average period of 2.0 years. Partnership Long-Term Incentive Plan The Partnership’s Long-Term Incentive Plan (the “Partnership Plan”) was adopted in October 2006 for the benefit of the employees, directors and consultants of the Partnership, us and our respective affiliates. A maximum of 1,035,378 common units, common unit options, restricted units and phantom units are available under the Partnership Plan. The Partnership Plan is administered by the board of directors of Archrock GP LLC, the general partner of the Partnership’s general partner, or a committee thereof (the “Partnership Plan Administrator”). Phantom units are notional units that entitle the grantee to receive common units upon the vesting of such phantom units or, at the discretion of the Partnership Plan Administrator, cash equal to the fair market value of such common units. Phantom units granted under the Partnership Plan 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 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. Partnership Phantom Units The following table presents phantom unit activity during the six months ended June 30, 2016:
| Phantom Units (in thousands) |  | Weighted Average Grant Date Fair Value per Unit
Phantom units outstanding, January 1, 2016 | 77 |  |  | $ | 27.01 |
Granted | 190 |  |  | 7.84 |
Vested | (68 | ) |  | 18.59 |
Phantom units outstanding, June 30, 2016 | 199 |  |  | 11.58 |
As of June 30, 2016, we expect $1.9 million of unrecognized compensation cost related to unvested phantom units to be recognized over the weighted-average period of 2.1 years.

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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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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