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Associate Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Postemployment Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits
The following are disclosures of the net periodic benefit cost components of postretirement medical benefits measured at January 1, 2017 and 2016.
 
 
Three months ended September 30,
 
Nine months ended September 30,
(Dollars in thousands)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
11

 
$
14

 
$
40

 
$
43

Interest cost
 
16

 
19

 
54

 
57

Prior service cost amortization
 
(19
)
 
(18
)
 
(57
)
 
(44
)
Net gain recognition
 
(18
)
 
(16
)
 
(52
)
 
(47
)
Net periodic benefit cost
 
$
(10
)
 
$
(1
)
 
$
(15
)
 
$
9

The following table shows the net periodic benefit cost components for the Alliance Associate Pension Plan benefits measured at January 1, 2017.
(Dollars in thousands)
 
Three months ended September 30, 2017
 
Nine months ended September 30, 2017
Service cost
 
$
10

 
$
30

Interest cost
 
75

 
225

Expected Return on Plan Assets
 
(135
)
 
(405
)
Prior service cost amortization
 
—

 
—

Net gain recognition
 
—

 
—

Net periodic benefit cost
 
$
(50
)
 
$
(150
)