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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
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, 2014 and 2013:
 
 
Pension Benefits
(in thousands)
Three months ended
June 30,
 
Six months ended
June 30,
2014
 
2013
 
2014
 
2013
Service cost
$
47

 
$
—

 
$
90

 
$
—

Interest cost
1,225

 
1,048

 
2,387

 
2,114

Expected return on plan assets
(1,903
)
 
(1,747
)
 
(3,808
)
 
(3,503
)
Recognized net actuarial loss
260

 
373

 
467

 
765

Benefit income
$
(371
)
 
$
(326
)
 
$
(864
)
 
$
(624
)
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,
2014
 
2013
 
2014
 
2013
Service cost
$
156

 
$
197

 
$
343

 
$
421

Interest cost
362

 
338

 
755

 
683

Amortization of prior service cost
(136
)
 
(136
)
 
(272
)
 
(272
)
Recognized net actuarial loss
178

 
377

 
407

 
737

Benefit cost
$
560

 
$
776

 
$
1,233

 
$
1,569