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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2018 and 2017:
 
Pension Benefits
(in thousands)
Three months ended March 31,
2018
 
2017
Interest cost
$
33

 
$
39

Recognized net actuarial loss
61

 
63

Benefit cost
$
94

 
$
102
Postretirement Benefits  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
 
Postretirement Benefits
(in thousands)
Three months ended March 31,
2018
 
2017
Service cost
$
87

 
$
123

Interest cost
187

 
300

Amortization of prior service cost
(228
)
 
—

Benefit cost
$
46

 
$
423