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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2015 and 2014:
 
Pension Benefits
(in thousands)
Three months ended
June 30,
 
Six months ended
June 30,
2015
 
2014
 
2015
 
2014
Service cost
$
63

 
$
47

 
$
118

 
$
90

Interest cost
(1,118
)
 
1,225

 
91

 
2,387

Expected return on plan assets
1,561

 
(1,903
)
 
—

 
(3,808
)
Recognized net actuarial loss
388

 
260

 
758

 
467

Benefit cost (income)
$
894

 
$
(371
)
 
$
967

 
$
(864
)
Postretirement Benefits  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
 
Postretirement Benefits
(in thousands)
Three months ended
June 30,
 
Six months ended
June 30,
2015
 
2014
 
2015
 
2014
Service cost
$
210

 
$
156

 
$
450

 
$
343

Interest cost
386

 
362

 
792

 
755

Amortization of prior service cost
(136
)
 
(136
)
 
(272
)
 
(272
)
Recognized net actuarial loss
367

 
178

 
759

 
407

Benefit cost
$
827

 
$
560

 
$
1,729

 
$
1,233