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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Stock-Based Compensation  
Summary of stock option activity
The following table presents stock option activity during the nine months ended September 30, 2017:
 
 
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, 2017
747

 
$
16.88

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(83
)
 
12.04

 
 
 
 

Canceled
(175
)
 
32.00

 
 
 
 
Options outstanding, September 30, 2017
489

 
12.28

 
1.8
 
$
1,494

Options exercisable, September 30, 2017
489

 
12.28

 
1.8
 
1,494
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, 2017:
 
 
Shares
(in thousands)
 
Weighted
Average
Grant Date
Fair Value
Per Share
Non-vested awards, January 1, 2017
1,612

 
$
10.08

Granted
811

 
12.95

Vested
(668
)
 
12.30

Canceled
(105
)
 
10.82

Non-vested awards, September 30, 2017 (1)
1,650

 
10.54


(1) 
Non-vested awards as of September 30, 2017 are comprised of 258,000 cash-settled restricted stock units and cash-settled performance units and 1,392,000 restricted shares and stock-settled performance units.
Exterran Partners, L.P.  
Stock-Based Compensation  
Schedule of phantom unit activity
The following table presents phantom unit activity during the nine months ended September 30, 2017:
 
 
Phantom
Units
(in thousands)
 
Weighted
Average
Grant Date
Fair Value
per Unit
Phantom units outstanding, January 1, 2017
197

 
$
11.60

Granted
81

 
16.28

Vested
(89
)
 
14.86

Canceled
(11
)
 
7.84

Phantom units outstanding, September 30, 2017
178

 
12.32