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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and 2018:
 
Pension Benefits
(in thousands)
Three months ended March 31,
2019
 
2018
Interest cost
$
29

 
$
33

Recognized net actuarial loss
58

 
61

Benefit cost
$
87

 
$
94
Postretirement Benefits  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
 
Postretirement Benefits
(in thousands)
Three months ended March 31,
2019
 
2018
Service cost
$
73

 
$
87

Interest cost
206

 
187

Amortization of prior service cost
(228
)
 
(228
)
Benefit cost
$
51

 
$
46