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ASSOCIATE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2018
Postemployment Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits
The following table presents the components of net periodic benefit cost related to our postretirement medical benefits plan measured at January 1, 2018 and 2017.
 
 
Three months ended June 30,
 
Six months ended June 30,
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
15

 
$
14

 
$
30

 
$
29

Interest cost
 
18

 
19

 
35

 
38

Prior service cost amortization
 
(19
)
 
(19
)
 
(38
)
 
(38
)
Net gain recognition
 
(12
)
 
(18
)
 
(23
)
 
(34
)
Net periodic benefit cost
 
$
2

 
$
(4
)
 
$
4

 
$
(5
)
the Alliance Associate Pension Plan measured at January 1, 2018.
 
 
Three months ended June 30,
 
Six months ended June 30,
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
10

 
$
10

 
$
20

 
$
20

Interest cost
 
74

 
75

 
147

 
150

Expected return on plan assets
 
(137
)
 
(135
)
 
(272
)
 
(270
)
Prior service cost amortization
 
—

 
—

 
—

 
—

Net gain recognition
 
—

 
—

 
—

 
—

Net periodic benefit cost
 
$
(53
)
 
$
(50
)
 
$
(105
)
 
$
(100
)