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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 and 2014:
 
Pension Benefits
(in thousands)
Three months ended
September 30,
 
Nine months ended
September 30,
2015
 
2014
 
2015
 
2014
Service cost
$
59

 
$
45

 
$
177

 
$
135

Interest cost
45

 
1,193

 
136

 
3,580

Expected return on plan assets
—

 
(1,903
)
 
—

 
(5,711
)
Recognized net actuarial loss
379

 
234

 
1,137

 
701

Benefit cost (income)
$
483

 
$
(431
)
 
$
1,450

 
$
(1,295
)
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,
2015
 
2014
 
2015
 
2014
Service cost
$
225

 
$
173

 
$
675

 
$
516

Interest cost
396

 
377

 
1,188

 
1,133

Amortization of prior service cost
(136
)
 
(136
)
 
(408
)
 
(408
)
Recognized net actuarial loss
379

 
203

 
1,138

 
609

Benefit cost
$
864

 
$
617

 
$
2,593

 
$
1,850