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STOCK-BASED COMPENSATION
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION
We have recognized stock-based compensation cost as shown below for the periods indicated.
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in thousands)
 
2018
 
2017
 
2018
 
2017
Restricted stock awards:
 
 
 
 
 
 
 
 
Performance stock awards
 
$
3,809

 
$
6,438

 
$
10,538

 
$
12,840

Service-based stock awards
 
4,247

 
4,208

 
9,319

 
9,132

 
 
8,056

 
10,646

 
19,857

 
21,972

Stock option awards
 
637

 
579

 
1,254

 
1,245

Total stock compensation cost
 
8,693

 
11,225

 
21,111

 
23,217

Less amounts capitalized to oil and gas properties
 
(5,598
)
 
(4,932
)
 
(11,286
)
 
(10,636
)
Stock compensation expense
 
$
3,095

 
$
6,293

 
$
9,825

 
$
12,581


Periodic stock compensation expense will fluctuate based on the grant-date fair value of awards, the number of awards, the requisite service period of the awards, employee forfeitures, and the timing of the awards. The decrease in total stock compensation cost in the 2018 periods as compared to the 2017 periods is primarily due to performance stock award forfeitures during the three months ended June 30, 2018. Our accounting policy is to account for forfeitures in compensation cost when they occur.