Stock-Based Compensation and Awards
12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation and Awards
18. Stock-Based Compensation and Awards

2015 Stock Incentive Plan

On October 30, 2015, our compensation committee and board of directors each approved the Exterran Corporation 2015 Stock Incentive Plan (the “2015 Plan”) to provide for the granting of stock options, stock appreciation rights, restricted stock, restricted stock units, performance awards, other stock-based awards and dividend equivalents rights to employees, directors and consultants of Exterran Corporation. The 2015 Plan became effective on November 1, 2015. The 2015 Plan also governs awards granted under the Archrock, Inc. 2013 Stock Incentive Plan and the Archrock, Inc. 2007 Amended and Restated Stock Incentive Plan which were adjusted into awards denominated in our common stock in accordance with the terms of the employee matters agreement and/or actions taken by our board of directors or the Archrock board of directors.

Awards granted by Archrock prior to the Spin-off (referred to as “Archrock awards”), which consisted of stock options, restricted stock, restricted stock units and performance units, were generally treated as follows in connection with the Spin-off:

Pre-2015 Awards. Immediately prior to the Spin-off, each outstanding Archrock stock option, restricted stock award, restricted stock unit award and performance unit award granted prior to January 1, 2015, whether vested or unvested, were split into two awards, consisting of an Archrock award and an Exterran Corporation award. For Archrock “incentive stock options” (within the meaning of Section 422 of the Code), the holder of the award had the option to elect, prior to the Spin-off, to convert such options into options denominated in shares of common stock of the applicable holder’s post-spin employer.

2015 Awards. Each Archrock 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 by us following the Spin-off were converted solely into an Exterran Corporation award. Archrock did not grant any stock options in the calendar year 2015 prior to the Spin-off.

In accordance with the anti-dilution provisions set forth in the individual Archrock award agreements, adjustments to the awards were made to ensure, to the extent possible, that the fair value of each award immediately prior to the Spin-off equaled the fair value of each such award immediately following the Spin-off. Adjustment and substitution of awards did not result in additional compensation expense.

Equity awards that were adjusted as described above are generally subject to the same vesting, expiration, performance conditions and other terms and conditions as applied to the underlying Archrock awards immediately prior to the Spin-off.

Stock-based compensation expense prior to the Spin-off only related to employees directly involved in our operations, and therefore, excluded stock-based compensation expense related to Archrock employees that supported both the international services and product sales businesses and the other businesses of Archrock that it retained after the Spin-off. Stock-based compensation expense subsequent to the Spin-off relates to employees, directors and consultants of Exterran Corporation, and as discussed above, such awards may consist of awards for either our common stock or Archrock’s common stock. The following table presents the stock-based compensation expense included in our results of operations (in thousands):
 
Years Ended December 31,
 
2016
 
2015
 
2014
Stock options
$
115

 
$
348

 
$
496

Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units
13,188

 
7,871

 
7,922

Restructuring and other charges—stock-based compensation expense
1,333

 
143

 

Total stock-based compensation expense
$
14,636

 
$
8,362

 
$
8,418


 
Stock Options

Stock options are granted at fair market value at the grant date, are exercisable according to the vesting schedule established and generally expire no later than ten years after the grant date. Stock options generally vest one-third per year on each of the first three anniversaries of the grant date.

The weighted average grant date fair value for stock options granted during the year ended 2014 was $14.47, and was estimated using the Black-Scholes option valuation model with the weighted average assumptions in the table below. There were no stock options granted during the years ended December 31, 2016 and 2015. As there were no stock option awards for Exterran Corporation’s common stock granted subsequent to the Spin-off, the significant assumptions presented below are the inputs Archrock used to calculate the grant date fair values of stock options granted prior to the Spin-off.
 
Years Ended December 31,
 
2016
 
2015
 
2014
Expected life in years
N/A
 
N/A
 
4.5

Risk-free interest rate
N/A
 
N/A
 
1.33
%
Volatility
N/A
 
N/A
 
46.51
%
Dividend yield
N/A
 
N/A
 
1.5
%


The risk-free interest rate was based on the U.S. Treasury yield curve in effect on the grant date for a period commensurate with the estimated expected life of the stock options. Expected volatility was based on the historical volatility of Archrock’s common stock over the period commensurate with the expected life of the stock options and other factors. The dividend yield was based on Archrock’s annualized dividend rate in effect during the quarter in which the grant was made.

The table below presents the changes in stock option awards for our common stock during the year ended December 31, 2016. Options outstanding on the Spin-off date, November 3, 2015, related to employees, directors and consultants of us and Archrock.
 
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
434

 
$
18.53

 
 
 
 
Granted

 

 
 
 
 
Exercised
(61
)
 
12.88

 
 
 
 
Cancelled
(77
)
 
27.20

 
 
 
 
Options outstanding, December 31, 2016
296

 
17.44

 
2.2
 
$
2,572

Options exercisable, December 31, 2016
284

 
16.80

 
2.1
 
2,572



Intrinsic value is the difference between the market value of our common 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 to purchase our common stock during the year ended December 31, 2016 was $0.1 million. As of December 31, 2016, we expect to recognize less than $0.1 million of additional compensation cost related to unvested stock options issued to our employees, directors and consultants, related to options to purchase either our common stock or Archrock’s common stock.

Restricted Stock, 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. 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 balance sheets. Grants of restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units generally vest one-third per year on each of the first three anniversaries of the grant date.

The table below presents the changes in restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units for our common stock during the year ended December 31, 2016. Non-vested awards relate to employees, directors and consultants of us and Archrock. Awards granted subsequent to November 3, 2015 only relate to our employees, directors and consultants.
 
Shares
 (in thousands)
 
Weighted
 Average
 Grant-Date
 Fair Value
 Per Share
Non-vested awards, January 1, 2016
1,004

 
$
22.17

Granted
773

 
15.46

Vested
(526
)
 
21.60

Change in expected vesting of performance units
138

 
15.46

Cancelled
(97
)
 
22.03

Non-vested awards, December 31, 2016 (1)
1,292

 
17.68

 
(1)
Non-vested awards as of December 31, 2016 are comprised of 182,000 cash settled restricted stock units and cash settled performance units and 1,110,000 restricted shares, restricted stock units and performance units.

As of December 31, 2016, we expect $15.5 million of unrecognized compensation cost related to unvested restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units issued to our employees, in the form of either our common stock or Archrock’s common stock, to be recognized over the weighted-average vesting period of 1.8 years.

Directors’ Stock and Deferral Plan
 
On October 30, 2015, our compensation committee and board of directors each approved the Exterran Corporation 2015 Directors’ Stock and Deferral Plan (the “Director Plan”). Under the Director Plan, which became effective on October 30, 2015, members of our board of directors may elect, on an annual basis, to receive 25%, 50%, 75% or 100% of their retainer and meeting fees (the “Retainer Fees”) in shares of our common stock in lieu of cash. The number of shares of our common stock issued to each director who elects to have a portion of their Retainer Fees paid in shares in lieu of cash is determined by dividing the applicable dollar amount of such portion by the closing sales price per share of our common stock on the last trading day of the quarter. Any portion of the Retainer Fees paid in cash will be paid to the director following the close of the calendar quarter for which such Retainer Fees were earned. Under the Director Plan, members of the board of directors may also elect to defer until a later date the receipt of the Retainer Fees that such director has elected to receive in the form of shares. The maximum aggregate number of shares of our common stock that may be issued under the Director Plan is 125,000 shares. The board of directors will administer the Director Plan and has the authority to make certain equitable adjustments under the Director Plan in the event of certain corporate transactions.