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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016:
 
Pension Benefits
(in thousands)
Three months ended September 30,
 
Nine months ended September 30,
2017
 
2016
 
2017
 
2016
Interest cost
38

 
49

 
116

 
145

Recognized net actuarial loss
63

 
36

 
189

 
109

Benefit cost
$
101

 
$
85

 
$
305

 
$
254
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,
2017
 
2016
 
2017
 
2016
Service cost
$
81

 
$
190

 
$
310

 
$
570

Interest cost
202

 
387

 
784

 
1,162

Amortization of prior service cost
(228
)
 
(88
)
 
(228
)
 
(266
)
Recognized net actuarial loss
—

 
192

 
—

 
576

Benefit cost
$
55

 
$
681

 
$
866

 
$
2,042