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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
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
Schedule of restricted stock, restricted stock unit, performance unit, cash settled restricted stock unit and cash settled performance unit activity
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

——————

(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.