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Employee Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2013
Pension Benefits
  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
Included as charges against income for the three and nine months ended September 30, 2013 and 2012 are the following amounts for pension and postretirement benefit plans maintained by the Company:
 
 
Pension Benefits
(in thousands)
Three months ended
September 30,
 
Nine months ended
September 30,
2013
 
2012
 
2013
 
2012
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
1,057

 
1,124

 
3,171

 
3,372

Expected return on plan assets
(1,751
)
 
(1,536
)
 
(5,254
)
 
(4,609
)
Recognized net actuarial loss
382

 
374

 
1,147

 
1,123

Benefit income
$
(312
)
 
$
(38
)
 
$
(936
)
 
$
(114
)
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,
2013
 
2012
 
2013
 
2012
Service cost
$
210

 
$
188

 
$
631

 
$
564

Interest cost
342

 
329

 
1,025

 
989

Amortization of prior service cost
(136
)
 
(135
)
 
(408
)
 
(407
)
Recognized net actuarial loss
368

 
320

 
1,105

 
960

Benefit cost
$
784

 
$
702

 
$
2,353

 
$
2,106