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

 
$
—

 
$
—

 
$
—

Interest cost
1,048

 
1,105

 
2,114

 
2,248

Expected return on plan assets
(1,747
)
 
(1,534
)
 
(3,503
)
 
(3,073
)
Recognized net actuarial loss
373

 
299

 
765

 
749

Benefit income
$
(326
)
 
$
(130
)
 
$
(624
)
 
$
(76
)
Postretirement Benefits
  
Employee Benefit Plans [Line Items]  
Schedule of Defined Benefit Plans Disclosures
 
Postretirement Benefits
 
Postretirement Benefits
(in thousands)
Three months ended
June 30,
 
Six months ended
June 30,
2013
 
2012
 
2013
 
2012
Service cost
$
197

 
$
184

 
$
421

 
$
376

Interest cost
338

 
327

 
683

 
660

Amortization of prior service cost
(136
)
 
(136
)
 
(272
)
 
(272
)
Recognized net actuarial loss
377

 
313

 
737

 
640

Benefit cost
$
776

 
$
688

 
$
1,569

 
$
1,404