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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
The following table presents stock option activity during the year ended December 31, 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 (1)
(249
)
 
6.55

 
 
 
 

Canceled
(86
)
 
16.06

 
 
 
 
Options outstanding and exercisable, December 31, 2018
154

 
19.40

 
1.6
 
$
—


——————
(1) 
Includes non-cash exercise of 219,000 options with a weighted average exercise price of $6.25.
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-based restricted stock unit, cash-settled restricted stock unit and cash- settled performance unit activity during the year ended December 31, 2018:
 
Shares
(in thousands)
 
Weighted
Average
Grant Date
Fair Value
Per Share
Non-vested awards, January 1, 2018
1,440

 
$
10.39

Granted (1)
1,148

 
9.66

Converted (2)
140

 
7.03

Vested (3)
(781
)
 
10.44

Canceled
(219
)
 
9.79

Non-vested awards, December 31, 2018 (4)
1,728

 
9.68

——————
(1) 
The weighted-average grant-date fair value of shares granted during the years ended December 31, 2018, 2017 and 2016 was $9.66, $12.95 and $6.09, respectively.
(2) 
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.
(3) 
The total fair value of all awards vested during the years ended December 31, 2018, 2017 and 2016 was $8.2 million, $10.8 million and $6.0 million, respectively.
(4) 
Non-vested awards as of December 31, 2018 are comprised of 216,000 cash-settled restricted stock units and cash-settled performance units and 1,512,000 restricted shares, stock-settled restricted stock units and performance-based restricted stock units.