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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2018 and 2017:
 
Pension Benefits
(in thousands)
Three months ended September 30,
 
Nine months ended September 30,
2018
 
2017
 
2018
 
2017
Interest cost
$
33

 
$
38

 
$
98

 
$
116

Recognized net actuarial loss
61

 
63

 
183

 
189

Benefit cost
$
94

 
$
101

 
$
281

 
$
305
Postretirement Benefits  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
 
Postretirement Benefits
(in thousands)
Three months ended September 30,
 
Nine months ended September 30,
2018
 
2017
 
2018
 
2017
Service cost
$
81

 
$
81

 
$
243

 
$
310

Interest cost
188

 
202

 
565

 
784

Amortization of prior service cost
(227
)
 
(228
)
 
(683
)
 
(228
)
Benefit cost
$
42

 
$
55

 
$
125

 
$
866