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ASSOCIATE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and 2018.
 
 
Three months ended March 31,
(Dollars in thousands)
 
2019
 
2018
Service cost
 
$
13

 
$
15

Interest cost
 
19

 
17

Prior service cost amortization
 
(19
)
 
(19
)
Net gain recognition
 
(15
)
 
(11
)
Net periodic benefit cost
 
$
(2
)
 
$
2

The following table presents the components of net periodic benefit cost related to the Beneficial pension benefits and other postretirement benefit plans.
 
 
One month ended March 31, 2019
(Dollars in thousands)
 
Pension Benefits
 
Other Postretirement Benefits
Service cost
 
$
—

 
$
8

Interest cost
 
286

 
59

Expected return on plan assets
 
(481
)
 
—

Prior service cost amortization
 
—

 
—

Net gain recognition
 
—

 
—

Net periodic benefit cost
 
$
(195
)
 
$
67

The following table presents the components of net periodic benefit cost related to the Alliance Associate Pension Plan measured at January 1, 2019 and 2018.
 
 
Three months ended March 31,
(Dollars in thousands)
 
2019
 
2018
Service cost
 
$
10

 
$
10

Interest cost
 
69

 
73

Expected return on plan assets
 
(147
)
 
(135
)
Prior service cost amortization
 
—

 
—

Net gain recognition
 
—

 
—

Net periodic benefit cost
 
$
(68
)
 
$
(52
)