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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Pension Benefits  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
The following are components of the net periodic benefit cost for the pension and postretirement benefit plans maintained by the Company for the three and six months ended June 30, 2018 and 2017:
 
Pension Benefits
(in thousands)
Three months ended June 30,
 
Six months ended June 30,
2018
 
2017
 
2018
 
2017
Interest cost
$
32

 
$
39

 
$
65

 
$
78

Recognized net actuarial loss
61

 
63

 
122

 
126

Benefit cost
$
93

 
$
102

 
$
187

 
$
204
Postretirement Benefits  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
 
Postretirement Benefits
(in thousands)
Three months ended June 30,
 
Six months ended June 30,
2018
 
2017
 
2018
 
2017
Service cost
$
75

 
$
106

 
$
162

 
$
229

Interest cost
190

 
282

 
377

 
582

Amortization of prior service cost
(228
)
 
—

 
(456
)
 
—

Benefit cost
$
37

 
$
388

 
$
83

 
$
811